In Chapter 8 we examined confidence intervals. Recall that to construct a confidence interval for the mean when the population standard deviation is unknown, the population must follow the normal probability distribution. To test this condition, the following data show a random sample of weekly visits by patients to Dr. Gregg’s chiropractic office. The data can also be found in the Excel file Dr. Gregg’s office.xlsx.

a. Using α = 0.05, perform a chisquare test to determine if the number of patient visits per week follows the normal probability distribution. = 100.6 and s = 18.7.

b. Determine the p_value using Excel and interpret its meaning.

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