Question 1

The report of a sample survey of 1014 adults says, "with 95% confidence, between 9% and 15% of all

Americans expect to spend more on gifts this year than last year."

What does the phrase "95% confidence" mean?

A. 9% to 15% of all Americans will spend 95% of what they spent last year.

B. The method used to get the interval 9% to 15%, when used over and over again,

produces intervals which include the true population proportion 95% of the

time.

C. 95% of all Americans will spend between 9% and 15% more than what they

spent last year.

D. There is a 95% chance that the percent who expect to spend more is between 9%

and 15%.

Question 2:

What is the critical value of t for a 90% confidence interval with df=14 (Assume a 2 tailed test)

A. 2.62449

B. 1.761310

C. 2.14479

D. 1.345030