Question: A marketing research firm wishes to compare the prices charged by two supermarket chains. The research firm using a standard shopping list of ten identical purchases at ten of each of the chain’s stores. The stores for each chain are randomly selected and the data is below:

1. Consider these samples as random samples and two tailed test to test the difference of two means. Determine your null and alternative hypothesis. Use a pooled standard deviation. (Hint: Minitab can do all the tedious calculations for you. Input your two columns of data into the Minitab worksheet; Go to Stats, then basic stats; under basic stats click on two sample t and continue.)
2. Test using alphas of .10, .05,.01 and .001.
3. Compute a 95% confidence interval for the difference of two means. Again, you can get the interval from your output.

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