Question: Problem 12 in Chapter 11 presented data from a study testing the effectiveness of Ritalin for increasing attention span for children with ADHD. Results from a sample of n = 25 children showed an average increase of attention span M_D = 6.8 minutes with a standard deviation of s = 5.5 after the children were administered the drug.

a. Make a point estimate of the population mean difference in attention span after children with ADHD take Ritalin.

b. Make an interval estimate of the population mean difference so that you are 99% confident that the true mean difference is in your interval.