Some people think that they do their best work in the morning, whereas others claim that they do their best work at night. We have dichotomized 20 office workers into morning or evening people (0 5...

Some people think that they do their best work in the morning, whereas others claim that they do their best work at night. We have dichotomized 20 office workers into morning or evening people (0 5 morning, 1 5 evening) and have obtained independent estimates of the quality of work they produced on some specified morning. The ratings were based on a 100-point scale and appear below

a.       Plot these data and fit a regression line. b. Calculate and test it for significance. c. Interpret the results.