Walmart has an interest in monitoring the average back to school spending for grade school students year to year. The following table shows the average back to school spending of households randomly sampled in 2013 and 2014 along with the population standard deviations and sample sizes for each sample.

a. Perform a hypothesis test using α = 0.10 to determine if the average household back to school spending in 2013 was different than it was in 2014.

b. Determine the p value and interpret the results.

c. Verify your results using PHStat.

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2013 2014 Sample mean Sample size Population standard deviation $606.40 S548.72 35 38 $160