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The article "Teenage Physical Activity Reduces Risk of Cognitive Impairment in Later Life"+ describes a study of more than 9,000 women from Maryland, Minnesota, 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 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 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 teenage girls O all women in Maryland, Minnesota, Oregon and Pennsylvania O all women O all women between 30 and 50 O all American women (b) Was the sample selected in a reasonable way? O No, they didn't ask men the same questions. O No, the sample only included women from four states, not all fifty. O Yes, the researchers include more than two states in their sample. O Yes, the sample is large enough to be reasonable.

The article "Teenage Physical Activity Reduces Risk of Cognitive Impairment in Later Life"+ describes a study of more than 9,000 women from Maryland, Minnesota, 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 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 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 teenage girls O all women in Maryland, Minnesota, Oregon and Pennsylvania O all women O all women between 30 and 50 O all American women (b) Was the sample selected in a reasonable way? O No, they didn't ask men the same questions. O No, the sample only included women from four states, not all fifty. O Yes, the researchers include more than two states in their sample. O Yes, the sample is large enough to be reasonable.

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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The article "Teenage Physical Activity Reduces Risk of Cognitive Impairment in Later Life"+ describes a study of more than 9,000 women from Maryland, Minnesota, 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 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 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 teenage girls all women in Maryland, Minnesota, Oregon and Pennsylvania all women all women between 30 and 50 all American women (b) Was the sample selected in a reasonable way? O No, they didn't ask men the same questions. No, the sample only included women from four states, not all fifty. Yes, the researchers include more than two states in their sample. Yes, the sample is large enough to be reasonable. (c) Is the sample likely to be representative of the population of interest? O Yes, because they used more than two states the results will be representative of the population of interest. No, because they only sampled from four states instead of all fifty. Yes, because they used such a large sample that the results will be representative of the population of interest. O No, because they didn't include men in the sample. (d) Are there any obvious sources of bias? asking teenage girls about physical activity later in life. the sampling method of just choosing four states not including men in the study O not asking teenage girls about their physical activity
Transcribed Image Text:The article "Teenage Physical Activity Reduces Risk of Cognitive Impairment in Later Life"+ describes a study of more than 9,000 women from Maryland, Minnesota, 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 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 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 teenage girls all women in Maryland, Minnesota, Oregon and Pennsylvania all women all women between 30 and 50 all American women (b) Was the sample selected in a reasonable way? O No, they didn't ask men the same questions. No, the sample only included women from four states, not all fifty. Yes, the researchers include more than two states in their sample. Yes, the sample is large enough to be reasonable. (c) Is the sample likely to be representative of the population of interest? O Yes, because they used more than two states the results will be representative of the population of interest. No, because they only sampled from four states instead of all fifty. Yes, because they used such a large sample that the results will be representative of the population of interest. O No, because they didn't include men in the sample. (d) Are there any obvious sources of bias? asking teenage girls about physical activity later in life. the sampling method of just choosing four states not including men in the study O not asking teenage girls about their physical activity
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