Suppose a medical researcher wants to know if people who exercise outdoors have

Question

Suppose a medical researcher wants to know if people who exercise outdoors have a greater incidence of severe respiratory illness than those who do not The researcher obtained a random sample of 125 individuals who had been treated for one of four different respiratory illnesses at a local hospital. She interviewed each individual about their exercise habits. Individuals were classified as getting scant outdoor exercise (less than one hour per week), moderate outdoor exercise (more than one but less than five hours per week), and considerable outdoor exercise (more than five hours per week). The number of individuals in each exercise category and each type of respiratory illness were recorded in a contingency (two-way) table The researcher plans to use the data in the table to conduct a chi-square test. Select the correct null, Ho, and alternative, Hi, hypotheses for this test. Ho: The distribution of exercise classification is the same for each type of respiratory illness. H1: The distribution of exercise classificatiog is not the same for each type of respiratory illnes. OHo: Increasing the amount of outdoor exercise has no effect on respiratory illness incidence. H: Increasing the amount of outdoor exercise increases respiratory illness incidence. ?Ho: Incidence of respiratory illness and outdoor exercise category are independent. H: Incidence of respiratory illness and outdoor exercise category are dependent.

Explanation / Answer

The correct null and alternative hypotheses of this test are:

H0: Incidence of respiratory illness and outdoor exercise category are independent.
H1: Incidence of respiratory illness and outdoor exercise category are not independent.

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