Question: Using the summary statistics in Exercise 3 and assuming that

Using the summary statistics in Exercise 3, and assuming that the data come from a distribution that is normally distributed,
a) Find a 95% confidence interval for the mean difference in ages of houses in the two neighborhoods using the df given in Exercise 7.
b) Why is the confidence interval narrower than the one you found in Exercise 9?
c) Is 0 within the confidence interval?
d) What does it say about the null hypothesis that the mean difference is 0?

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