stats pt 2

An eight-year cohort study of 3,454 initially disease-free volunteer men and women (ages around 60 years or more) recorded the extent of physical activity the participants engaged in and whether or not they were showing signs of healthy aging. The results are given in the table below.

	Inactive	Moderate	Vigorous	ROW TOTAL
Healthy aging	55	345	265	665
Unhealthy aging	598	1347	844	2789
COLUMN TOTAL	653	1692	1109	n = 3454

Answer the following questions based on this information.

Flag this QuestionQuestion 16 pts

What is the explanatory and response variables?

Group of answer choices

The explanatory variable is type of aging . The response is type of physical activity .

The explanatory variable is type of aging . The response is the number of individuals who used the different types of physical activity .

The explanatory variable is type of physical activity. The response is the number of individuals who had healthy or unhealthy aging.

The explanatory variable is type of physical activity. The response is type of aging.

Flag this QuestionQuestion 26 pts

What is the null hypothesis?

Group of answer choices

There is a difference in type of physical activity depending on type of aging.

There is a difference in type of aging depending on type of physical activity.

There is no difference in type of physical activity depending on type of aging.

There is no difference in type of aging depending on type of physical activity.

Flag this QuestionQuestion 36 pts

What is the alternative hypothesis?

Group of answer choices

There is no difference in type of physical activity depending on type of aging.

There is a difference in type of physical activity depending on type of aging.

There is a difference in type of aging depending on type of physical activity.

There is no difference in type of aging depending on type of physical activity.

Flag this QuestionQuestion 46 pts

Are the validity conditions satisfied?

Group of answer choices

Yes, all cells in the contingency table are at least 10.

No, the data was too strongly skewed.

Yes, there were at least 10 successes and failures in the vigorous category.

No, the sample size was too small.

Flag this QuestionQuestion 56 pts

The test statistic LaTeX: chi^2 = 66.050

{Ï‡}^{2} = 66.050

and the p-value = 0. Which of the following statements are true. Select all that are true.

Group of answer choices

The researchers would reject the null.

The null is plausible.

The strength of evidence against the null is strong.

The results are not statistically significant.

Flag this QuestionQuestion 66 pts

Select all of the following statements which are true.

Group of answer choices

The researchers can conclude that the level of activity caused the significant differences in proportions of healthy aging participants.

The researchers may have made a type II error.

The researchers may have made a type I error

This sample of participants represent the population of all men and women of ages around 60 years or more.

Flag this QuestionQuestion 76 pts

Which of the following describes the consequences if the researchers had made a type I error?

Group of answer choices

We would conclude that healthy aging depends on type of activity but it doesn’t.

We would conclude that healthy aging does not depend on type of activity but it does.

We can’t conclude anything because we don’t have a random sample.

We would conclude that type of activity depends on healthy aging.

Flag this QuestionQuestion 86 pts

Which of the following describes the consequences if the researchers had made a type II error?

Group of answer choices

We would conclude that healthy aging depends on type of activity but it doesn’t.

We can’t conclude anything because we don’t have a random sample.

We would conclude that type of activity depends on healthy aging.

We would conclude that healthy aging does not depend on type of activity but it does.

Flag this QuestionQuestion 92 pts

On a scale of 1 to 10, rate how weird this semester has been. 1 meaning not weird at all and 10 meaning very weird.

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