Fifteen years ago the average weight of American men between the ages of 30 and 50 was = 166 pounds.

 = 44.5 with SS = 5040. On the basis of this sample, can the psychologist conclude that depression for elderly people is significantly different from depression in the general population? Test at the .05 level of significance.

4.        A fund raiser for a charitable organization has set a goal of averaging at least $25 per donation. To see if the goal is being met, a random sample of recent donations is selected. The data for this sample are as follows: 20, 50, 30, 25, 15, 20, 40, 50, 10, and 20. Use a one-tailed test with a = .05 to determine whether the donations are averaging significantly greater than $25.