(06.03 mc) marcus wants to determine how age ...

(06.03 mc) marcus wants to determine how age and weight are related to exercise preference in his town. he selects a simple random sample of 75 overweight individuals from the 25 - to 35 - year age group and records their age, weight, and exercise preference (sports, pilates/yoga, dancing, none). he also selects an independent simple random sample of 50 normal - weight individuals from the 40 - to 50 - year age group and records the same information. which is the most important observation about marcuss plan? (3 points) the plan is well conceived and should serve the intended purpose. he will be unable to tell whether a difference in exercise preference is related to a difference in age or to a difference in weight. he should have used equal sample sizes. his samples are too small. he should have selected the two age groups randomly instead of choosing them specifically.

Answer

# Brief Explanations: Marcus is studying two factors (age and weight) related to exercise preference. But by having different age - weight combinations in each sample, he can't isolate the effects of age and weight on exercise preference. For example, one sample has younger overweight people and the other has older normal - weight people. So, it's hard to tell if differences in exercise preference are due to age or weight. # Answer: He will be unable to tell whether a difference in exercise preference is related to a difference in age or to a difference in weight.