could someone demonstrate how to work the statsical problem please. d· There are

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could someone demonstrate how to work the statsical problem please.

d· There are no important observational studies. 11. (Extra Credit) Assume that I want to know about PE issues not just in all males at GCC, but also want to take into account their age and weight. Specifically, I want to know how many younger men at GCC have PE issues and how many older man at GCC have PE issues. I also want to know how many overweight and how many normal weight males have PE issues. I know that of the 12,000 males at GCC, 80% are "younger" men and 20% are "older" men. I also know that for both of these groups, half are normal weight and half are over- weight, I make a table as shown below to help me determine how many men of each type I need in my small group of 100 in order that this small group really "represents" the 12,000 men at GCC. For cach blank cell (there are 8) write a number that indicates how many of that particular type of man I need to randomly select into my small group of 100 Younger men Older men Totals Normal weight men Overweight men Totals 100

Explanation / Answer

So, half are overweight, and half are normal weight.

So, the totals on the right are both 50.

Now, to 80% are younger, and 20% are older. So, the total of "Younger Men" is 80, and the total of "Older Men" is 20.

Now, we get 80% of 50, and that's 40. That's the entry for both cells on the "Younger Men" column.

Now, we get 20% of 50, and that's 10. That's the entry for both cells on the "Older Men" column.

Now, consider the table:

Younger Men Older Men Totals Normal Weight Men 40 10 50 Overweight Men 40 10 50 Totals 80 20 100

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