An article investigated the consumption of caffeine among women. A sample of 56 women were asked to monitor their caffeine intake over the course of one day. The mean amount of caffeine consumed in...

Extracted text: An article investigated the consumption of caffeine among women. A sample of 56 women were asked to monitor their caffeine intake over the course of one day. The mean amount of caffeine consumed in the sample of women was 202.574 mg with a standard deviation of 213.063 mg. In the article, researchers would like to include a 99% confidence interval. • The values below are t critical point corresponding to 90%, 95%, 98%, and 99% confidence. Which critical point corresponds to 99% confidence? 1.673 2.668 2.004 2.396 • With 99% confidence, we estimate the mean amount of caffeine consumed by women is between • If the level of confidence were changed to 90%, what effect would this have on the width of the calculated confidence interval? mg and mg. (Round the limits of your interval to 4 decimal places.) there would be no effect on the interval the interval would narrow the interval would widen