Walmart has an interest in monitoring the average back-to-school spending for grade-school students year to year....

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

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Expert Solution

orchestra answered 1 year ago

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Walmart has an interest in monitoring the average back-to-school spending for grade-school students year to year....

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....

Walmart has an interest in monitoring the average back-to-school spending for grade-school students year to year....

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....

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