A 2013 Gallup poll asked randomly selected U.S. adults whether they wanted to st

Question

A 2013 Gallup poll asked randomly selected U.S. adults whether they wanted to stay at their current body weight or change. One purpose was to investigate whether there was any difference between men and women with regard to this aspect. Of the 562 men surveyed, 242 wanted to stay at their current weight, whereas of the 477 women surveyed, 172 wanted to stay at their current weight.

a. Is this an experiment or an observational study? Explain how you are deciding.

b. Organize the data in an appropriate well-labeled 2 x 2 table.

c. Find the observed difference in the conditional proportion of those who wanted to stay at their current weight between men and women.

d. Give two possible explanations for the observed difference in conditional proportions as reported in part (c).

Explanation / Answer

a. It is an observational study. Because here we dont have to perform any experiment. We only need to collect data and observe the numbers.

b.

Conditional proportion of people who wants to stay in current weight:

for men =

for women =

Stay in current weight Change current weight Total Men 242 320 562 Women 172 305 477 Total 414 625 1039

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