In Exercise 9.63 you could not reject the null hypothesis that the mean amount spent by men and the mean amount spent by women for clothing are the same, using a two-tailed test with a significance level of 0.05.
a. If you found a 95% confidence interval for the difference between means, would it capture 0? Explain.
b. If you found a 99% confidence interval, would it capture 0? Explain.
c. Now go back to Exercise 9.63. Find a 95% confidence interval for the difference between means, and explain what it shows.