Peggy collects data for the restaurant where she works. In a sample of regular customers, she collected data on the number of restaurant visits per week (x) and customer satisfaction (y). Both variables are on a 0–7 scale, with higher numbers indicating more frequent visits to the restaurant and greater levels of satisfaction. Her data were:

a. Calculate the correlation for Peggy’s data.

b. What is the null hypothesis for these data?

c. What is the degrees of freedom value for these data?

d. If Peggy conducts a two-tailed test, what should the critical values for an NHST be?

e. Should she reject or retain the null hypothesis?

f. Is the p-value (a) greater than .05, (b) between .01 and .05, or (c) less than .01?

g. What is the r² value?

h. Draw a scatterplot that represents these data.

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