Question

Walmart has an interest in monitoring the average back-to-school spending for grade-school students year to year. Every year the back-to-school spending data is published by the National Retail Federation. The following table shows the average back-to-school spending of households randomly sampled in 2016 and 2017 along with the population standard deviations and sample sizes for each sample.
2016 2017
Sample mean $606.40 $655.27
Sample size 35 38
Population standard deviation $160 $173
a. State the correct null and alternative hypotheses.



b. Perform a hypothesis test using α = 0.10 to determine if the average household back-to-school spending in 2016 was different than it was in 2017.







c. Use Confidence Interval to test this hypotheses

Answer 1