A Psychology Professor Believed He Should Know What Assumptions, Prejudices

Essay

A psychology professor believed he should know what assumptions, prejudices, and knowledge students begin the introductory psychology course with. Accordingly, over the years he had given a 40-item true-false test on the first day of class to help himself orient to the new class. On the first day everyone was in class and the following scores were obtained. Arrange them into a grouped frequency distribution. The smallest interval is 3-5 and the largest is 36-38. From the grouped frequency distribution find the mean, median, and mode. Graph the data using the appropriate method. If the data are skewed, tell the direction. Are these data a population or a sample? $$\begin{array} { r r r r r r r r r r r r r } 12 & 24 & 6 & 9 & 9 & 20 & 13 & 14 & 17 & 20 & 23 & 13 & 9 \\10 & 7 & 11 & 14 & 12 & 38 & 22 & 13 & 7 & 28 & 20 & 33 & 15 \\6 & 33 & 16 & 11 & 9 & 5 & 21 & 26 & 15 & 14 & 9 & 8 & 13\end{array}$$