A paired-difference experiment was conducted to compare the means of two populations:

a. Do the data provide sufficient evidence to indicate that µ1 differs from µ2? Test using α = .05.
b. Find the approximate p-value for the test and interpret its value.
c. Find a 95% confidence interval for (µ1 - µ2). Compare your interpretation of the confidence interval with your test results in part a.
d. What assumptions must you make for your inferences to be valid?

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Pairs Population 2 3 4 5 1.3 16 1.4 17 12 15 12 18