Testing for equality of mean.
1. A computer is programmed to make 100 draws at random with replacement from the box (0,0,0,0,1), and take their sum. It does this 144 times; the average of the 144 sums is 21.13. The program is working fine. Or is it?
Working fine Something is wrong
Choose one option, and explain your reason.
2. (Hypothetical.) Is Wheaties a power breakfast? A study is done in an elementary statistics class; 499 students are free to participate. After the midterm, 250 are randomized to the treatment group, and 249 to the control group. The treatment group is fed Wheaties for breakfast 7 days a week. The control group gets Sugar Pops.
a) Final scores averaged 66 for the treatment group; the SD was 21. For the control group, the figures were 59 and 20. What do you conclude?
b) What aspects of the study could have been done "blind"