1. For a givenN, the interval that bounds the population mean at the 99% confidence level is ____ that which bounds the population mean at the 95% confidence level

A. equal to

B. greater than

C. less than

D. can't be determined

2. When using the t test, we rejectH₀____. A.ift_obtt_crit

B. if |t_obt||t_crit|

C. if |t_obt||t_crit|

D. ift_obtt_crit

3. Exhibit 13-1 A researcher believes that women today weigh less than in previous years. To investigate this belief, he randomly samples 41 adult women and records their weights. The scores have a mean of 111 lbs. and a standard deviation of 12.4. A local census taken several years ago shows the mean weight of adult women was 115 lbs. Refer to Exhibit 13-1. The obtained value of the appropriate statistic for testingH₀is ____. A.t_obt=-2.07

B. t_obt= +3.07

C. t_obt=-1.32

D. t_obt= +0.32

4. Exhibit 13-1 A researcher believes that women today weigh less than in previous years. To investigate this belief, he randomly samples 41 adult women and records their weights. The scores have a mean of 111 lbs. and a standard deviation of 12.4. A local census taken several years ago shows the mean weight of adult women was 115 lbs. Refer to Exhibit 13-1. The df for determiningt_crit= ____. A.41

B. 40

C. 39

D. need more information

5. If= 30,s= 5.2,= 28.0,s= 6.1 andN= 13, the value of the most powerful statistic to test the significance of the sample mean is ____. A.-1.18

B. 1.96

C. 2.18

D. -1.39

Confidence interval is defined as ____. A.a range of values that probably contains the population value

B. a range of values that probably contains the population mean

C. a range of values that probably contain the population standard deviation

D. a range of values that contains the population mode