The article Teenage Physical Activity Reduces Risk of Cognitive Impairment in La

Question

The article Teenage Physical Activity Reduces Risk of Cognitive Impairment in Later Life"+ describes a study of more than 9000 women from Maryland, Minnesota, results of this study to all American women. In the press release, the researcher who conducted the study is quoted as saying the following. Our study shows that women who are regularly physically active at any age have lower risk of cognitive impairment than those who are inactive but that being Oregon, and Pennsylvania. The women were asked about their physical activity as teenagers and at ages 30 and 50. A press release about this studyt generalized the physically active at teenage is most important in preventing cognitive impairment. Answer the following four questions for this observational study. (a) What is the population of interest? O all women between 30 and 50 all American women O all women O all women in Maryland, Minnesota, Oregon and Pennsylvania (b) Was the sample selected in a reasonable way? No, the sample only included women from four states, not all fifty No, they didn't ask men the same questions. Yes, the sample is large enough to be reasonable. Yes, the researchers include more than two states in their sample. (c) Is the sample likely to be representative of the population of interest? No, because they didn't include men in the sample ves, because they used more s will ber Typ, here to

Explanation / Answer

The study is carried out on 9000 women of four states of America

PART (a)

As the results/conclusions of the study are generalized for all the women of America, therefore, the population of interest is all American women.

hence the correct option is B

PART (b)

The sample was not selected in a reasonable way.

While it concluded results for all American women it only involved women from 4 states.

The sample of women recruited for the study belonged to only four states, thereby ignoring the fact that women from other states might have had some effect on the study due to their habits, bringing up, social background, etc.

hence, the correct option is A

no, the sample only included women from 4 states, not all fifty

PART (c)

Here the target population or the population of interest is all American women as the results are generalized for all American women, but the sample only includes women from only 4 states and not all over America.

therfore, the sample is not representative of the population of interest.

Hence, the correct option is D

No, because they only sampled from four states instead of fifty.

PART (d)

Yes, in this observational study selection bias is present which arises when, the sample for the study is not a random selection from the target population for which the statement is to be made.

Here, the target population is all American women while sample for this study included women from only 4 states.

Hence, the source of bias and the correct option is C

The sampling method of just choosing four states.

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.