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23 - Comparing Two Categorical Variables Solutions 1 Sleep...

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Comparing Two Categorical Variables - Solutions 1: Sleep apnea is a pattern of irregular breathing during sleep, with longer than normal breath-holding intervals. The following two-way table shows counts of men and women with sleep apnea or not, from a sleep study with 400 men and 300 women. Sleep Apnea? Gender Yes No Men 40 360 Women 12 288 a. Calculate the risk of sleep apnea for men in this study. 40/400 = 0.10 (or 10%) b. Calculate the risk of sleep apnea for women in this study. 12/300 = 0.04 (or 4%) c. Find the value that completes this sentence: The risk of sleep apnea for men is ___ times the risk for women. In other words, determine the relative risk. Relative risk = .10/.04 = 2.5 d. Find the value that completes this sentence: The odds of sleep apnea for men are __ times the odds for women. In other words, find the odds ratio. Odds Ratio = (.10/.90)/(.04/.96) = 2.67 2 : Open the Class Survey data file. Use Stat>Tables>CrossTabulation and Chi-Square to answer the following questions. Put Gender (C2) in the row and the variable Ever Cheat (C14). Be sure the box for Row Percents is checked . The variable Ever Cheat is student responses to whether they ever cheated on a significant other. a. Fill in this table with row percents . Ever Cheat

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23 - Comparing Two Categorical Variables Solutions 1 Sleep...

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