Question

This quiz relates to Section 8.1 - Confidence Intervals for a Population Proportion. The indicated problems relate to exercises found on pp. 501-503 in the main textbook (IPS).

You will have two attempts at this quiz. I suggest you do all of them first on paper. After the first attempt, you should write down which ones you answered correctly and which one incorrectly, as well as any hints that were given. Then re-solve the problems and take the quiz a second time. Note that the responses will appear in a different order the second time you take the quiz. Correct answers will appear on Canvas, twenty four hours after the quiz is due.

By submitting this quiz you affirm you did not receive any help from anyone in completing the quiz, except for clarifications provided by the instructor.  Use of the course videos, PowerPoint, textbook and handbook is acceptable.

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Question 11 pts

Your manager asks you to estimate the percent of adults in Indiana who enjoy going to musical events. They request your estimate be accurate to within plus or minus 2%, with 95% confidence. A similar study done a year ago resulted in 60% saying they enjoyed going to musical events. How many people should be surveyed to meet your manager's requirements?

Group of answer choices

2304

24

2401

2305

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Question 21 pts

If you wish to cut the margin of error for an estimate in half (without changing the level of confidence in your result) you must multiply the sample size by:

Group of answer choices

2

0.5

4

1.4

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Question 31 pts

IPS Exercise #8.18b)

Are the guidelines for a "sufficiently large sample" met for question #8.14?

Group of answer choices

No, since less than 1000 students were surveyed.

Yes, since more than 40 people were surveyed.

Yes, since there were at least 10 students who responded "YES" and at least 10 who responded "NO".

No, since less than half the students responded "YES".

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Question 41 pts

IPS Exercise #8.18c)

Find the 95% confidence interval for the proportion of students who eat breakfast regularly.

Group of answer choices

30.9% to 41.8%

35.3% to 37.3%

31.9% to 40.8%

36.0% to 37.0%

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Question 51 pts

IPS Exercise #8.30a)

Find the margin of error for the NSSE question about doing community or volunteer work, using the 99% confidence level.

Group of answer choices

1.3%

0.3%

0.2%

0.6%

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Question 61 pts

Should the answer to the previous question surprise you?

Group of answer choices

Yes, a margin of error can't be less than 1%.

No, nothing in statistics should surprise you.

Yes, because the desired confidence was quite high.

No, because the sample size was really large.

Answer 1

Ans11 )

Sample Size Determination
Data
Estimate of True Proportion	0.6
Sampling Error	0.02
Confidence Level	95%
Intermediate Calculations
Z Value	-1.9600
Calculated Sample Size	2304.8753
Result
Sample Size Needed	2305.0000

option d is true

2305

Ans 21

If you wish to cut the margin of error for an estimate in half (without changing the level of confidence in your result) you must multiply the sample size by:4

for rest answers problem 8.14 not given