Question: For the data in Exercise 3, a) Test the null hypothesis at = 0.05 using the pooled t-test. (Show the t-statistic, P-value, and conclusion.)

For the data in Exercise 3,

a) Test the null hypothesis at α = 0.05 using the pooled t-test. (Show the t-statistic, P-value, and conclusion.)

b) Find a 95% confidence interval using the pooled degrees of freedom.

c) Are your answers different from what you previously found in Exercise 11? Explain briefly why or why not.

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