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 (nrf.com). The following table shows the average backto-school spending of households randomly sampled in 2016 and 2017 along with the population standard deviations and sample sizes for each sample.

a. State the correct null and alternative hypotheses.

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

c. Determine the p-value and interpret the results.

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2016 2017 Sample mean Sample size Population standard deviation $160 $606.40 $655.27 35 38 $173