ACCOUNTING

Question 30 of 40 0.0/ 2.5 Points

A researcher wishes to estimate the mean amount of money spent per month on food by households in a certain neighborhood. She desires a margin of error of $30. Past studies suggest that a population standard deviation of $248 is reasonable. Estimate the minimum sample size needed to estimate the population mean with the stated accuracy.

 

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A. 274

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B. 284

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C. 264

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D. 272

Question 31 of 40 0.0/ 2.5 Points

Select the best fit line on the scatter diagram below.

https://study.ashworthcollege.edu/access/content/group/8ef8b2f7-197d-41de-a4c4-db81a717c013/v9/Images/Lesson%206%20Exam/MA260%20Lesson%206%20exam%20question%2011.JPG

 

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A. A

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B. B

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C. C

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D. All of the lines are equally good

Question 32 of 40 2.5/ 2.5 Points

Eleven female college students are selected at random and asked their heights. The heights (in inches) are as follows:

67, 59, 64, 69, 65, 65, 66, 64, 62, 64, 62

Estimate the mean height of all female students at this college. Round your answer to the nearest tenth of an inch if necessary.

 

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A. It is not possible to estimate the population mean from this sample data

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B. 64.3 inches

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C. 64.9 inches

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D. 63.7 inches

Question 33 of 40 2.5/ 2.5 Points

Among a random sample of 500 college students, the mean number of hours worked per week at non-college related jobs is 14.6. This mean lies 0.4 standard deviations below the mean of the sampling distribution. If a second sample of 500 students is selected, what is the probability that for the second sample, the mean number of hours worked will be less than 14.6?

 

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A. 0.5

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B. 0.6179

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C. 0.6554

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D. 0.3446

Question 34 of 40 2.5/ 2.5 Points

A researcher wishes to estimate the proportion of college students who cheat on exams. A poll of 560 college students showed that 27% of them had, or intended to, cheat on examinations. Find the 95% confidence interval.

 

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A. 0.2323 to 0.3075

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B. 0.2325 to 0.3075

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C. 0.2325 to 0.3185

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D. 0.2323 to 0.3185

Question 35 of 40 0.0/ 2.5 Points

Select the best estimate of the correlation coefficient for the data depicted in the scatter diagram.

https://study.ashworthcollege.edu/access/content/group/8ef8b2f7-197d-41de-a4c4-db81a717c013/v9/Images/Lesson%206%20Exam/MA260%20Lesson%206%20exam%20question%201.JPG

 

 

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A. -0.9

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B. 0.9

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C. 0.5

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D. -0.5

Question 36 of 40 2.5/ 2.5 Points

Monthly incomes of employees at a particular company have a mean of $5954. The distribution of sample means for samples of size 70 is normal with a mean of $5954 and a standard deviation of $259. Suppose you take a sample of size 70 employees from the company and find that their mean monthly income is $5747. How many standard deviations is the sample mean from the mean of the sampling distribution?

 

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A. 0.8 standard deviations above the mean

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B. 0.8 standard deviations below the mean

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C. 7.3 standard deviations below the mean

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D. 207 standard deviations below the mean

Question 37 of 40 2.5/ 2.5 Points

A sample of nine students is selected from among the students taking a particular exam. The nine students were asked how much time they had spent studying for the exam and the responses (in hours) were as follows:

18, 7, 10, 13, 12, 16, 5, 20, 21

Estimate the mean study time of all students taking the exam. Round your answer to the nearest tenth of an hour if necessary.

 

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A. 13 hours

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B. 12.2 hours

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C. 13.6 hours

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D. It is not possible to estimate the population mean from this sample data

Question 38 of 40 0.0/ 2.5 Points

The scatter plot and best-fit line show the relation between the price per item (y) and the availability of that item (x) in arbitrary units. The correlation coefficient is -0.95. Determine the amount of variation in pricing explained by the variation in availability.

https://study.ashworthcollege.edu/access/content/group/8ef8b2f7-197d-41de-a4c4-db81a717c013/v9/Images/Lesson%206%20Exam/MA260%20Lesson%206%20exam%20question%2012.JPG

 

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A. 5%

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B. 10%

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C. 95%

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D. 90%

Question 39 of 40 2.5/ 2.5 Points

Sample size = 400, sample mean = 44, sample standard deviation = 16. What is the margin of error?

 

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A. 1.4

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B. 1.6

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C. 2.2

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D. 2.6

Question 40 of 40 2.5/ 2.5 Points

The graph shows a measure of fitness (y) and miles walked weekly. Identify the probable cause of the correlation.

https://study.ashworthcollege.edu/access/content/group/8ef8b2f7-197d-41de-a4c4-db81a717c013/v9/Images/Lesson%206%20Exam/MA260%20Lesson%206%20exam%20question%204.JPG

 

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A. The correlation is coincidental.

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B. There is a common underlying cause of the correlation.

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C. There is no correlation between the variables.

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D. Walking is a direct cause of the fitness.

 

 

 

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