A college professor wants to estimate the difference in mean…
A college professor wants to estimate the difference in mean test scores of students who have taken his statistics and genetics classes in the past 10 years. He selects a random sample of 20 student records from the statistics course and a random sample of 22 student records from the genetics course. These two samples were independent random samples. The study provided the results shown in the table below. Construct a 95% confidence interval for the true difference in population means of these two populations of students. Statistics Genetics Sample size 20 22 Sample mean 78 75 Sample standard dev. 10 12