Refer to the previous exercise about the study of the relationship between sleep apnea and hypertension. Show how to calculate the chi-square statistic by setting up the formula with appropriate numbers.

Data from previous exercise

In a study of the relationship between sleep apnea and hypertension (New England Journal of Medicine, 2000), researchers Peppard et al. categorized the participants by the severity of sleep apnea at the beginning of the study, and four years later recorded whether or not the participant had hypertension. Here is the table of the summarized data:

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Severity of sleep apnea Not Somewhat Severe Very Total 277 Yes 32 40 40 142 32 63 Severe hypertension? 69 27 132 67 No No 155 616 365 893 Total 187 507