Data on the disk and website show reaction distances in centimeters for the dominant hand for a random sample of 40 independently chosen college students.
Smaller distances indicate quicker reactions.
a. Make a graph of the distribution of the sample, and describe its shape.
b. Find, report, and interpret a 95% confidence interval for the population mean.
c. Suppose a professor said that the population mean should be 10 centimeters. Test the hypothesis that the population mean is not 10 cm, using the four-step procedure, with a significance level of 0.05.