In the Past,of All the Students Enrolled in "Basic Business

Multiple Choice

In the past,of all the students enrolled in "Basic Business Statistics" 10% earned A's 20% earned B's,30% earned C's,20% earned D's and the rest either failed or withdrew from the course.Dr Johnson is a new professor teaching "Basic Business Statistics" for the first time this semester.At the conclusion of the semester,in Dr.Johnson's class of 60 students,there were 10 A's,20 B's,20 C's,5 D's and 5 W's or F's.Assume that Dr.Johnson's class constitutes a random sample.Dr Johnson wants to know if there is sufficient evidence to conclude that the grade distribution of his class is different than the historical grade distribution. If we assume at = .05 that the null hypothesis is rejected,make a one-sentence managerial conclusion.

A) Dr.Johnson's class grades don't differ from the historical course grade distribution.
B) Dr.Johnson's class grades are higher than the historical course grade distribution.
C) Dr.Johnson's class grades are Lower than the historical course grade distribution.
D) We cannot draw a conclusion about the difference between Dr.Johnson's grades and the historical course grade distribution.