III. Analyzing a survey
On Canvas, you can find a reprint of an article (The attachment is article )from Popular Science. Your job is to comment on what is described in the article. Hand in a page or two with your comments. Find as many specific errors in the sampling, analysis, and presentation as you can. Would you expect the conclusions here to be accurate? Why or why not?

IV. Designing an Experiment
The National Institutes of Mental Health (NIMH) wants to know whether intense education about the risks of AIDS will help change the behavior of people who now report sexual activities that put them at risk of infection. NIMH investigators screened 38,893 people to identify 3706 suitable subjects. The subjects were assigned to a control group (1855 people) or an intervention group (1851 people). The control group attended a one-hour AIDS education session; the intervention group attended seven single-sex discussion sessions, each lasting 90 to 120 minutes. After 12 months, 64% of the intervention group and 52% of the control group said they used condoms. (None of the subjects used condoms before the study began.)

1. Explain why they needed a control group in this experiment.

2. Use a diagram to outline the design of this experiment.

3. Are all the principles of experimental design present in this design? Explain.

4. Suppose you were in charge of assigning the subjects to the groups. Give a complete and careful description of how you would do it. And then assign the first ten of your individuals to their groups. You may use this portion of a random number table if you need it.

14042 53536 07779 04157 41172 36473 42123 43929 50533 33437
59911 08256 06596 48416 69770 68797 56080 14223 59199 30162
62368 62623 62742 14891 39247 52242 98832 69533 91174 57979
57529 97751 54976 48957 74599 08759 78494 52785 68526 64618
15469 90574 78033 66885 13936 42117 71831 22961 94225 31816

18625 23674 53850 32827 81647 80820 00420 63555 74489 80141
74626 68394 88562 70745 23701 45630 65891 58220 35442 60414
11119 16519 27384 90199 79210 76965 99546 30323 31664 22845
41101 17336 48951 53674 17880 45260 08575 49321 36191 17095
32123 91576 84221 78902 82010 30847 62329 63898 23268 74283

Attachments:

landslide_for_nuclear_power.pdf

Statistics

write a 7 page paper and a presentation using a real life business scenario and applying statistics to make a determination. basically prove that the deployment of mobile office equipment decreased the number of appointments necessary to process a prospect.

Statistics

write a 7 page paper and a presentation using a real life business scenario and applying statistics to make a determination. basically prove that the deployment of mobile office equipment decreased the number of appointments necessary to process a prospect.