Answer:
D
Explanation:
The correct answer is (D). Note that the margin of interval is 0.02 (half the length of the interval). The interval is not entirely above 0.5, so we cannot conclude that a majority of young adults drink coffee daily. The interval gives no information about what is happening over time. Finally, if we were to repeat the procedure many times, the resulting intervals would capture the true population proportion 95% of the time rather than strive to adhere to the results of this one random sample.
Tara mows lawns as a summer job. She
charges $9.50 for each lawn plus $2.50 for
every hour she works. The gasoline she needs
to mow an average lawn costs $1.85. Write an
expression for the profit Tara makes from
cutting a single lawn.
Answer:
9.50+(2.50x)1.85
Explanation:
I think this might be it because you don't really get the time she works for a lawn
Answer:
7.65 + 2.50h
Explanation:
The original expression for finding her profit is:
($9.50x + $2.50h) - 1.85x
x being the number of lawns she mows
h being the number of hours she works
If she were to only mow one lawn, the expression would be:
($9.50(1) + $2.50h) - 1.85(1)
h remains constant because we do not know the number of hours she works for
The above expression simplified:
($9.50 + $2.50h) - 1.85
So, I do... $9.50 - 1.85 to get...
$7.65 +$2.50h
1.Sharon is a good student who enjoys statistics. She sets a goal for herself to do well enough compared to her peers so that her standardized score on her Statistics final is equal to her percentile rank (written as a decimal) among her classmates. What goal did she set for herself?
(A)0.25
(B)0.78
(C)1.09
(D)2.25
(E)2.41
Answer: B
Explanation: 0.78
PLEASE PLEASE HELP:: The scoop of an excavator holds 26 ft3 of sand. If the capacity of a freight car is 39 tons of sand and we know that 1 ft3 of sand weighs 0.5 tons, how many freight cars can be filled with 120 loads?
Answer:
40
Explanation:
Since we know that 1 ft3 of sand = 0.5 tons, we can make a proportion
26/x=1/0.5
If you simplify it, you should get x=13
Now that we know 26 ft3 of sand = 13 tons, we should multiply it with 120 number of loads
13*120=1560
Then, we have to divide 1560 by 39 which should give your answer 40
Hope this works!
Freight cars can be filled with 120 loads is 40
How is load percentage calculated?
The load factor percentage is derived by dividing the total kilowatt-hours (kWh) consumed in a designated period by the product of the maximum demand in kilowatts (kW) and the number of hours in the period.
Since we know that 1 ft3 of sand = 0.5 tons, we can make a proportion
26/x=1/0.5
If you simplify it, you should get x=13
Now that we know 26 ft3 of sand = 13 tons, we should multiply it with 120 number of loads
13*120=1560
Then, we have to divide 1560 by 39 which should give your answer 40
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9.A game show producer asked 100 randomly selected adults, “Have you ever bungee jumped?” Of the adults surveyed, 14 said “Yes!” Is there convincing statistical evidence that the true proportion of all adults that have bungee jumped is more than 10%?
(A)No, because the difference between the sample proportion and the population proportion is only 0.04, which is not greater than 0.05.
(B)No, because the probability of observing a sample proportion at least as large as 0.14, if the population proportion is 0.10, is greater than 0.05.
(C)Yes, because the probability of observing a sample proportion at least as large as 0.14, if the population proportion is 0.10, is greater than 0.05.
(D)Yes, because the probability of observing a sample proportion at least as large as 0.14, if the population proportion is 0.10, is less than 0.05.
(E)Yes, because the difference between the sample proportion and the population proportion is 0.04, which is less than 0.05.
Answer: B.
Explanation: No, Because the probability of observing a sample proportion at least as large as 0.14, if the population proportion is 0.10, is greater than 0.05.
Let us recall from given question that,
H0:p=0.80
Ha:p≠0.80 (which is the two tailed test)
For the p-value we have,
P-value: Let us assume that the null hypothesis is true, then the probability of observing the sample statistics or the more extreme,
Therefore if p= 0.80, the probability of observing or detecting proportion of samples is of at least 0.84 or at most 0.76 is 0.273.
What occurs in Type I error?A Type I error occurs in hypothesis testing when one is rejects the null hypothesis and the null hypothesis is true.
To reject the null hypothesis, statisticians conduct hypothesis testing. However, the process is always accompanied by the possibility of making a mistake. These are referred to as hypothesis testing errors.
Type I and Type II errors are the two mutually exclusive errors in hypothesis testing. Type II errors occur when a statistician fails to reject a false null hypothesis, whereas Type I errors occur when a statistician correctly rejects a genuine null hypothesis. So, c is the right response.
Therefore if p= 0.80, the probability of observing or detecting proportion of samples is of at least 0.84 or at most 0.76 is 0.273.
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11. Which of the following is FALSE?
Answer:
E. This die appears to be fair because of the proportion of sixes fluctuates greatly.
Explanation:
I hope this helped if its wrong then im sorry.
10. Lindsey is an avid tennis player. She kept track of the number of winners she had per game for an entire season. The shape of the distribution of the number of winners is roughly symmetric and the five- number summary of the number of winners is: Min: 10 Q1: 18 Med: 48 Q3: 79 Max: 92
Luke is Lindsey’s biggest rival. The average number of winners Luke had per game for the season has the same value as Lindsey’s IQR. Who had the greatest average number of winners this season? Explain.
(A)Lindsey, she averaged approximately 48 winners per game while Luke only averaged 18 winners per game.
(B)Lindsey, she averaged approximately 49.4 winners per game while Luke only averaged 48 winners per game.
(C)Luke, he averaged 61 winners per game while Lindsey only averaged approximately 48 winners per game.
(D)Luke, he averaged 61 winners per game while Lindsey only averaged approximately 79 winners per game.
(E)There is not enough information provided to determine Lindsey’s average.
Answer:
c
Explanation:
James was the lead in the school play. It was opening night. Mr. Ramirez, the director, asked James if he was ready to go on and reminded him about a few last-minute changes in the script. A number of thoughts and feelings came over James as the curtain went up. James became anxious when he saw all the faces of the audience members. Then he saw his mother, who is a professional actress, sitting in the front row. James could not relax. At that instant, he saw his psychology teacher in the audience. He knew that he needed to use the concepts learned in her class to make sense of these thoughts, feelings, and surroundings.
Describe how each of the following concepts might help James give a strong performance.
State-dependent memory
Arousal theory
Positive reinforcement
Selective attention
Imagery
Social facilitation
Sensory adaptation
Answer:
Check below for the answer and explanations
Explanation:
State-dependent memory: is the process of remembering things because they happen when you were in a state that is similar to your current state. Before the opening night, James would have gone through series of rehearsals, it will be easy for him to recollect the things he said or did during the rehearsal and apply same in the opening night.
Arousal theory: This theory explains that people tend to have a better performance when they are psychologically motivated. James felt motivated when he saw his psychology teacher in the audience. This motivation will enhance is performance.
Positive reinforcement: James motivated himself by wanting to use the concept learnt in his psychology class to have a positive thought about the surrounding atmosphere. This is a positive reinforcement because James felt motivated after this consideration.
Selective attention: This is the process of focusing only on relevant information or object. James paid more attention to those whose presence can aid his performance. He did not have to set his gaze on every member of the audience.
Imagery: In this context, imagery is the use of mental, imaginary pictures to influence one's thought process. As James is on the stage, there should be a mental picture of when he was taking similar roles during the rehearsals, this will help him perform better.
Social facilitation: The presence of a large audience aids the performance of some people. They tend to perform better in the presence of crowd. James can utilize the advantage of the cheers and the applause he receives from the audience for a better performance.
Sensory adaptation: As James spends more time outside performing, his senses tend to adapt to that atmosphere and the initial fright and timidity will disappear. At this stage, he begins to perform incredibly well.
State dependence memory is the process of remembering things due to what happened. They take place when you are in a state similar to the current state.
Arousal theory suggests that people are driven to take actions that tend to maintain an optimal level of psychological arousal. Selective attention is a process that allows the individual to focus on a specific topic, or input for further processing. Imagery is any visual figurative language that evokes a mental image. Social facilitation is the improvement or the decrease of performance when working together with other people. Sensory adaptation is the reduction of the sensitivity to stimus after long exposure.Learn more about the lead in the school play. It was opening night.
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what does the sentence skills section of ACCUPLACER ask students to do
A. Read passages and determine how to improve them
B. Improve sentences without changing their meaning
C. rewrite essays to improve the organization of ideas
D. write their own sentences using correct grammar and punctuation
Answer:
D
Explanation:
I think its d because when people write sentences they need to finish there sentences with punctuation.They also need to use correct grammer.
Answer:
B. Improve sentences without changing their meaning.
Explanation:
°•HOPE IT HELPS YOU•°
4. An organization that strives to hold agencies accountable for truth in news reporting plans to select a random sample of 100 news stories from major U.S. news agencies in order to estimate the proportion of news stories produced by major U.S. news agencies that contain false information. A 90 percent confidence interval for the proportion of all news stories that contain false information will then be constructed. Before selecting the sample, the organization determines that they want to make the margin of error as small as possible. Which of the following is the best way for them to decrease the margin of error?
(A)Increase the confidence level to 95%.
(B)Increase the confidence level to 99%.
(C) Include a wider diversity of sources, such as local and international news agencies.
(D)Include news stories over a broad period of time, such as over the past decade.
(E) Increase the sample size.
Answer: E) Increase the sample size
Explanation: with the confidence level and sample proportion held constant, the margin of error will decrease as the sample size increases.
18. What is the correct test statistic and conclusion?
Answer:
A
Explanation:
It is A
The developments described in the excerpt most directly reflect which of the
following changes in the 1920s? "The Model T was the car of the century,
transforming motoring for millions. Its cheapness and flexibility meant that the
car became less of a symbol of wealth and leisure than an affordable adjunct to
the everyday life of even the humblest worker. And the key to its cheapness was
its revolutionary production method."-Source: Steven Parissien, historian. The
Life of the Automobile: The Complete History of the Motor Car, 2013 *
A. the development of highways
B. the spread of regional cultures
C. the rise in consumerism
D. the promotion of free trade
Answer:
c
Explanation:
YOU WILL GET BRAINLIEST!! What could help a country move from Stage 1 to Stage 2 of the demographic
transition?
- Instituting population restrictions
-increased immigration
-The diffusion of contraceptives
-better sanitation
-Improving education for women
Answer:
i would think population restrictions
Explanation
stage 2 is characterized by a rapid decrease in a country’s death rate so the total population of a country in Stage 2 will rise
6. The supply manager at a local ice cream shop claims that 80% of customers prefer chocolate over vanilla. One of the employees believes that is an overstatement. He selects a random sample of 50 customers and found that 30 of them preferred chocolate over vanilla. Which of the following is the appropriate margin of error for a 95 percent confidence interval to estimate the population proportion of all customers that prefer chocolate over vanilla?
Answer:C
Explanation:
15. Which of the following gives the correct test statistic and p-value?
Answer:
D
Explanation:
Trust
What is the derivative of -cot(2x)?
Answer:
[tex]\displaystyle y' = 2 \csc^2 (2x)[/tex]
General Formulas and Concepts:
Calculus
Differentiation
DerivativesDerivative NotationDerivative Property [Multiplied Constant]: [tex]\displaystyle \frac{d}{dx} [cf(x)] = c \cdot f'(x)[/tex]
Basic Power Rule:
f(x) = cxⁿf’(x) = c·nxⁿ⁻¹Derivative Rule [Chain Rule]: [tex]\displaystyle \frac{d}{dx}[f(g(x))] =f'(g(x)) \cdot g'(x)[/tex]
Explanation:
Step 1: Define
Identify
[tex]\displaystyle y = - \cot (2x)[/tex]
Step 2: Differentiate
Trigonometric Differentiation [Derivative Rule - Chain Rule]: [tex]\displaystyle y' = - \big(- \csc^2 (2x) \big)(2x)'[/tex]Simplify: [tex]\displaystyle y' = \csc^2 (2x)(2x)'[/tex]Basic Power Rule [Derivative Property - Multiplied Constant]: [tex]\displaystyle y' = 2 \csc^2 (2x)[/tex]Topic: AP Calculus AB/BC (Calculus I/I + II)
Unit: Differentiation
According to the proclamation, what were African Americans promised in return for fighting for the British in the War of 1812?
Answer: Their freedom
Explanation:
How did monasticism impact Buddhism?
What is AP (Advanced Placement?)
Answer:
Advanced Placement is a program in the United States and Canada created by the College Board which offers college-level curricula and examinations to high school students. American colleges and universities may grant placement and course credit to students who obtain high scores on the examinations.
Explanation:
AP Is also High educated children in middle, to high
i know i know a b c
d
Answer:
what do you mean by a b c d ?
Explanation:
3. The phrase, household penetration, describes the percentage of households that purchase a particular item. The household penetration for toilet paper is 97%. You survey a random sample of 50 households and want to compute the probability that at least one of the households does not purchase toilet paper. Which of the following is appropriate for modeling this distribution?
(A)Binomial distribution
(B)Geometric distribution
(C)Normal distribution
(D)t distribution
(E)Chi-square distribution
Answer:
A) Binomial Distribution
Explanation:
This situation is binary because there are two options. Either success (buy toilet paper) or failure (do not buy toilet paper). The trials are independent, there are a fixed number of trials, and the probability of success remains the same for each trial. Therefore, it is a binomial distribution.
2.In a certain region of the United States, the distribution of the number of siblings an individual has is strongly skewed to the right with a mean of 1.8 siblings. Which of the following is a possible value for the median of this distribution?
(A)1
(B)2
(C)3
(D)4
(E)5
Answer: A
Explanation: In a distribution that is skewed to the right, the value of the Mean will be greater than the value of the median. Because the meaning of this distribution is 1.8 siblings, the median must be less than 1.8 siblings. The only other choice that is less than 1.8 is the value one, so the median must be one sibling.Mean will be greater than the value of the median. Because the meaning of this distribution is 1.8 siblings, the median must be less than 1.8 siblings. The only other choice that is less than 1.8 is the value one, so the median must be one sibling
What % of people in LDC’s (Less Developed Countries) are farmers?
Omg help me please this is due today
Answer: 17 people died initially
Explanation:
the a value is the number in front of the parenthese. A value is the initial value
Write a story about a man who does and then comes back to life and then you have to write it in Spanish or in Vietnamese
16. Which of the following is the correct interval?
Answer
C
Explanation:
It is correct
In extreme driving conditions such as snow, ice or heavy rain, you should stay at
least seconds behind the next vehicle.
A. 2-3
B. 4
C. 6-10
One good way to cut down on the expenses of technology while in college is
to:
A. borrow your friend's computer.
B. use a smartphone for most of your communication needs.
c. take advantage of the free Wi-Fi available on most college
campuses.
O D. use a typewriter.
Answer:
C and A
Explanation:
For A you first look through his history
Take advantage of the free Wi-Fi available on most college campuses. The correct option is C.
What is technology?Technology refers to the tools, techniques, and processes that are used to create, develop, and improve products, services, and processes.
It encompasses a wide range of fields such as electronics, telecommunications, software, computers, and robotics.
College campuses typically offer free Wi-Fi for their students, which can be used to access the internet and other resources on a laptop, tablet, or smartphone.
Using these resources can help cut down on technology expenses, as students can use their own devices instead of purchasing new ones or relying on friends to borrow theirs.
Additionally, using a smartphone for communication needs may not be as efficient or practical as using a laptop or tablet, and using a typewriter is an outdated technology that is not commonly used anymore.
Thus, the correct option is C.
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17. Which of the following scenarios describes an experiment?
Answer: A
Explanation: There is a treatment given which is the classical music playing. The other choices are being observed and recorded.
8. Candidate A and Candidate B are running for president. You are planning a survey to determine what proportion of registered voters plan to vote for Candidate A (p). You will contact a random sample of registered voters. You want to estimate p with 99% confidence and a margin of error no greater than 0.01. What is the minimum number of registered voters you will need to survey in order to meet these requirements?
(A)97
(B)166
(C)6,766
(D)9,604
(E)16,590
Answer:
The correct answer is (E).
The minimum sample size of registered voters that are needs to be surveyed in order to meet these requirements is 16590 registered voters.
What is the required sample size?The sample size, n, can be calculated using the formula below:
[tex]n = \frac{z^{2}×p(1-p)}{(\frac{ε}{2}) ^{2}}[/tex]
where:
z = is the z scoreε is the margin of errorpis the population proportionFor the data provided:
z for 99% confidence = 2.58
ε/2 = 0.005
p = 0.5
Substituting the values:
[tex]n = \frac{2.58^{2}×0.5(1-0.5)}{0.005^{2}} = 16641[/tex]
Therefore, the minimum sample size of registered voters that are needs to be surveyed in order to meet these requirements is 16590 registered voters.
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14. A manager of a local fast food restaurant wants to determine the average amount of time it takes from when a customer enters the drive-through line until they receive their order, regardless of the time of the day and the day of the week. That is, he would like to know the true average drive-through wait time for all his customers. Which of the following methods would be most likely to estimate the desired parameter with low bias and low variability?
(A)Select a random sample of 100 customers over a period of one month, determine each selected customer’s wait time, then compute the average wait time for all 100 customers.
(B)Select a random sample of 100 customers over a weekend, determine each selected customer’s wait time, then compute the average wait time for all 500 customers.
(C) Select a random sample of 500 customers on a randomly selected weekday, determine each selected customer’s wait time, then compute the average wait time for all 500 customers.
(D)Select a random sample of 500 customers over a weekend, determine each selected customer’s wait time, then compute the average wait time for all 500 customers.
(E) Select a random sample of 500 customers over a period of one month, determine each selected customer’s wait time, then compute the average wait time for all 500 customers.
Answer:E
Explanation:
Select a random sample of 500 customers over a period of one month, determine each selected customer’s wait time, then compute the average wait time for all 500 customers.
Why sampling is important?Sampling saves money by allowing researchers to gather the same answers from a sample that they would receive from the population.
Select a random sample of 500 customers over a period of one month, determine each selected customer’s wait time, then compute the average wait time for all 500 customers. it will help in the improve to deduce the time and might be get idea so that costumer will not wait rather than ideal time.
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