Customers of four companies were surveyed and placed into three categories: repeat customers, non-repeat satisfied customers, and non repeat/dissatisfied customers.

a. What is the null hypothesis for this study?

b. Is a one- or a two-tailed test appropriate for this example?

c. How many degrees of freedom are in the data?

d. If α = .05, what is the χ²_crit value for the data?

e. Create the contingency table with expected values.

f. Calculate the χ²_obs value.

g. Compare the χ²_crit value and the χ²_obs value. Should you reject or retain the null hypothesis in this example?

h. Calculate and interpret an odds ratio where Company A is the baseline group and being a repeat customer is the outcome of interest. Combine the other groups together and the other outcomes together in order to calculate a single odds ratio.

i. Interpret the effect size in question 15h.

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Repeat Non-repeat satisfied Non-repeat/dissatisfied Company customers customers customers Total A 42 22 10 74 В 18 15 7 40 C 61 45 15 121 D 50 26 6. 82 Total 171 108 38 317