1. You are interested in whether a group on a weight loss program has lost more weight than the general population. You know = 0, but you don't know the value of . You therefore compute the standard error of the mean (sM) to test the hypothesis that your weight loss program results in more loss of weight than the general population. If your mean weight loss is 8 pounds, with s = 4 and n = 25, the sM is

a. .8 b 1.5 c 2.8 d 7

2. T or F When we know the population mean, we use a z-score to convert means rather than a t-Score.

3. You are conducting a single-sample t-test to test the hypothesis that children who drink sugary soda and fruit juices weigh more than children who drink water. Your sample size is 30, and you want to use a one-tailed test with = 0.05. The critical value for your t-test is

a 1.684 b 0.703 c 1.699 d 1.708

4. You run a one-sample t-test, two-tailed, = 0.05, with df = 12, and obtain a t-statistic of 2.567. The critical value you need to meet and exceed is _________, and you ____________ the null hypothesis of no differences.

a. 2.201 accept b. 4.303 reject c 2.201 reject d. 4.303 accept

5 T or F When a researcher rejects the null hypothesis with = 0.05, he/she is stating that true differences exist between the sample and the population at least 95% of the time.