College Athletes' Weights
In Exercise , you could reject the null hypothesis that the mean weights of soccer and baseball players were equal 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 90% interval, would it capture 0? Explain.
c. Now go back to Exercise 9.64. Find a 95% confidence interval for the difference between means, and explain what it shows.
Exercise
College Athletes' Weights A random sample of male college baseball players and a random sample of male college soccer players were obtained independently and weighed.
The table shows the unstacked weights (in pounds). The distributions of both data sets suggest that the population distributions are roughly Normal.
Determine whether the difference in means is significant, using a significance level of 0.05.
