Annual child care costs for infants are considerably higher than for older children. At α = 0.05, can you conclude a difference in mean infant day care costs for different regions of the United States? (Annual costs per infant are given in dollars.)
Assume that all variables are normally distributed, that the samples are independent, and that the population variances are equal. Also, for each exercise, perform the following steps.
a. State the hypotheses and identify the claim.
b. Find the critical value.
c. Compute the test value.
d. Make the decision.
e. Summarize the results, and explain where the differences in the means are.
Use the traditional method of hypothesis testing unless otherwise specified.

  • CreatedSeptember 02, 2015
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