For the following questions, imagine a study of whether meditation increases life expectancy:

 

22. Suppose the research hypothesis is supported using the hypothesis-testing procedure, but, in reality, the null hypothesis is true. What does this mean in the context of the study?

A. Meditation does not increase life expectancy , and the hypothesis test does not suggest that it does.

B. Meditation increases life expectancy , but the hypothesis test does not suggest that it does.

C. Meditation does not increase life expectancy , but the hypothesis test suggests that it does.

D. Meditation increases life expectancy , and the hypothesis test suggests that it does.

 

23. What is true if the research hypothesis is supported using the hypothesis-testing procedure, and, in reality, the research hypothesis is true?

A. Meditation does not increase life expectancy , and the hypothesis test does not suggest that it does.

B. Meditation increases life expectancy , and the hypothesis test suggests that it does.

C. Meditation does not increase life expectancy , but the hypothesis test suggests that it does.

D. Meditation increases life expectancy , but the hypothesis test does not suggest that it does.

 

24. What is true if the study is inconclusive using the hypothesis-testing procedure, and, in reality, the null hypothesis is true?

A. Meditation does not increase life expectancy , and the hypothesis test does not suggest that it does.

B. Meditation increases life expectancy , but the hypothesis test does not suggest that it does.

C. Meditation increases life expectancy , and the hypothesis test suggests that it does.

D. Meditation does not increase life expectancy , but the hypothesis test suggests that it does.

 

25. What is true if the study is inconclusive using the hypothesis-testing procedure, but, in reality, the research hypothesis is true?

A. Meditation increases life expectancy , and the hypothesis test suggests that it does.

B. Meditation does not increase life expectancy , and the hypothesis test does not suggest that it does.

C. Meditation does not increase life expectancy , but the hypothesis test suggests that it does.

D. Meditation increases life expectancy , but the hypothesis test does not suggest that it does.

Hypothesis testing with ANOVA opinions about whether caffeine enhances test performance differ. You design a study to test the impact of drinks with different caffeine contents on students' test-taking abilities. You choose 21 students at random from your introductory psychology course to participate in your study. You randomly assign each student to one of three drinks, each with a different caffeine concentration, such that there are seven students assigned to each drink. You then give each of them a plain capsule containing the precise quantity of caffeine that would be consumed in their designated drink and have them take an arithmetic test 15 minutes later.

The students receive the following arithmetic test scores:

1.) You plan to use an ANOVA to test the impact of drinks with different caffeine contents on students' test-taking abilities. What is the null hypothesis?

(a) The population mean test score for the cola population is different from the population mean test score for the black tea population.

(b) The population mean test scores for all three treatments are equal.

(c) The population mean test scores for all three treatments are different.

(d) The population mean test scores for all three treatments are not all equal.

2.) Calculate the degrees of freedom and the variances for the following ANOVA table:

The formula for the F-ratio is:

3.) Using words, the formula of the F-ratio can be written as:

4.) Using the data from the ANOVA table given, the F-ratio can be written as:

5.) Calculate for F-ratio:

6.) At the level of significance, what is your conclusion?

(a)You can reject the null hypothesis; you do not have enough evidence to say that caffeine affects test performance.

(b)You cannot reject the null hypothesis; caffeine does appear to affect test performance.

(c)You cannot reject the null hypothesis; you do not have enough evidence to say that caffeine affects test performance.

(d)You can reject the null hypothesis; caffeine does appear to affect test performance.

Chapter 8 of independence sample t-test

1. A social work agency specializes in treating families in crisis. One of their goals is to increase the stability of the family, reducing the frequency of times of distress. The common practice in the agency is for a team of crisis counselors to respond in those times that families are in distress, hopefully helping them to learn healthier ways to cope with the challenges they face. A new director has arrived, and wants to test a new kind of intervention. For this intervention, the social work counselors will meet regularly with clients to educate them on stress and conflict management strategies, in addition to being available on an as needed basis. The director decides to test the new intervention, by assigning one group of families to be in the 'control' condition, and simply receive the usual assistance, and another group of families to be in the 'intervention' condition, who also receive the regularly scheduled stress and conflict management education. The director wants to know whether families who receive the intervention score better on a family stability test than families who do not receive the intervention.

*Please see the attachment for the image*