1. Imagine a researcher posed a null hypothesis that in a certain community, the average energy expenditure should be 2,100 calories per day. He randomly sampled 100 people in that community. After he computed the t value by calculating a two-tailed t-statistic, he found that the probability value was 0.10. Thus, he concluded:

a. The average energy expenditure was bigger than 2,100 calories per day

b. The average energy expenditure was smaller than 2,100 calories per day

c. He could not reject the null hypothesis that the average energy expenditure was 2,100 calories per day

d. The average energy expenditure was either more than 2,100 calories per day or less than 2,100 calories per day

2. Compared to the normal distribution, the t distribution has ___ values at the top and ___ at the tails.

a. More; less

b. More; more

c. Less; less

d. Less; more

3. In order to test if there is a difference between means from two populations, which of following assumptions are NOT required?

a. The dependent variable scores must be a continuous quantitative variable.

b. The scores in the populations are normally distributed.

c. Each value is sampled independently from each other value.

d. The two populations have similar means

4. A professor wanted to test all possible pairwise comparisons among six means. How many comparisons did he need to compare?

a. 5

b. 6

c. 10

d. 15