Reference no: EM132155518

1) The report of a sample of 1014 adults says, "with 95% confidence, between 9% and 15% of all American expect to spend on gifts this year than last year

What does the phrase "95% confidence" mean?

a)The method used to get the interval 9% to 15%, when used over and over again, produces interval which the true population proportion 95% of the time

b) There is a 95% chance that the percent who expect to spend more is between 9% and 15%

c) 95% of all American will spend 9% and 15% more than what they spent last year  

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

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

a) 1.34503

b) 1.761310

c) 2.14479

d) 2.62449  

d) 2.62449