Heart rate data for a random sample of males and females was obtained. The data are available at the text’s website. Use the data to answer these questions. Data were originally published in the Journal of Statistics Education online data archive and accessed through StatCrunch.

a. Find a 95% confidence interval for the difference between the mean heart rates of males and females. Based on your confidence interval, is there a significant difference in the mean heart rates of females and males? Explain.

b. Use a significance level of 0.05, test the hypothesis that the mean heart rates of males and females are significantly different.