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MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Please answer from question 4 - 10 only

Transcribed Image Text:QUESTION 2
You conduct a study to understand whether happy people are more likely to exercise than sad people. In your sample of happy people. 25 chose to exercise and 10 chose to
take a nap. In your sample of sad people, 5 chose to exercise and 35 chose to take a nap.
(1) What is the null hypothesis?
a. There is a difference in rates of exercise among happy and sad people.
b. There is an association in rates of exercise among happy and sad people.
c. There is not a difference in rates of exercise among happy and sad people.
d. There is not an association in rates of happiness among those who exercise and those who nap.
(2) What is the expected frequency for happy people who exercise?
(3) What is the expected frequency for sad people who exercise?
(4) What is the expected frequency for happy people who nap?
(5) What is the expected frequency for sad people who nap?
(6) What is your chi-square value?
(7) How many degrees of freedom are there?
(8) Assuming alpha is equal to .05, what is the critical value?
(9) What is your decision?
a. Reject the null and decide that happy people are more likely to exercise.
b. Fail to reject the null and decide that happy people are more likely to exercise.
c. Reject the null and decide that happy people are not more likely to exercise.
d. Fail to reject the null and decide that happy people are not more likely to exercise.
(10) What is the effect size (phi-coefficient)?
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