Question

QUESTION 3

1. Which of the following increases the range of a confidence interval (select all that apply)?

   		Decreasing the confidence level
   		Decreasing the standard deviation
   		Increasing the sample size
   		Increasing the standard deviation
   		Decreasing the same size
   		Increasing the confidence level

12 points   

QUESTION 4

1. As I've mentioned, sample size is so important because it's the only way we learn about the population. But in one of the techniques we've discussed, sample size is particularly important. Which one is it?

   		Confidence interval when the population standard deviation is unknown
   		Determining the sample size of a proportion
   		Confidence interval of a proportion
   		Confidence interval when the population standard deviation is known

12 points   

QUESTION 5

1. Which of the following is an example of a Type I error? (Select all that apply.)

   		Going on a date with a rude and terrible person.
   		Buying a book that turned out to be terrible.
   		Ignoring a job opportunity that you not only could have got but would have been a great fit for you.
   		Not eating at a restaurant that you would have loved.

20 points   

QUESTION 6

1. Which of the following is an example of a null hypothesis?

   		Spending more on advertising will have some kind of effect on a company's profits (the profits will increase or decrease).
   		The health benefits of running a mile a day are the same as the health benefits of walking a mile a day.
   		A hybrid car has better gas mileage than a regular car of equal size.
   		Drinking four glasses of water every day will help you fall asleep at night.

12 points   

QUESTION 7

1. Which of the following requires a two-tailed test? (Select all that apply.)

   		Testing if sales in a new location are unusual from what you know to be standard.
   		Determining if a machine filling M&M bags is functioning properly.
   		Inquiring if a more expensive internet connection is any faster than what you're currently using.
   		Testing if Title IX (a law requiring equal treatment for women in education) enriched the opportunties available for women.
   		Inquiring if a poll of Americans concerning marijuana legalization over- or under-estimates their opinion of the measure.

Answer 1

3) Increasing the standard deviation

Decreasing the sample size

Increasing the confidence level

4) Confidence interval when the population standard deviation is unknown.

5) Ignoring a job opportunity that you not only could have got but would have been a great fit for you.

Not eating at a restaurant that you would have loved.

6) The health benefits of running a mile a day are the same as the health benefits of walking a mile a day.

7) Testing if sales in a new location are unusual from what you know to be standard

Determining if a machine filling M & M bags is functioning properly.

Inquiring if a poll of Americans concerning marijuana legalization over-or-under-estimates their opinion of the measure.

Determining if a