# 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?

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?

## Answer to relevant Questions

Using the summary statistics in Exercise 4, and assuming that the data come from a distribution that is normally distributed, a) Find a 95% confidence interval for the mean difference in page views from the two websites. b) ...For each of the following scenarios, say whether the data should be treated as independent or paired samples. Explain briefly. If paired, explain what the pairing involves. a) An efficiency expert claims that a new ergonomic ...Consumers increasingly make food purchases based on nutrition values. Consumer Reports examined the calorie content of two kinds of hot dogs: meat (usually a mixture of pork, turkey, and chicken) and all beef. The ...The accounting firm described in Exercise 28 is interested in providing opportunities for its auditors to gain more expertise in statistical sampling methods. They wish to compare traditional classroom instruction with ...It has been suggested that global climate change may be affecting the frequency of tropical storms. The data here show the number of tropical cyclones (including hurricanes) assigned official names by the National Hurricane ...Post your question