A Biology Professor Reports That Historically Grades in Her Introductory

Essay

A biology professor reports that historically grades in her introductory biology course have
been distributed as follows: 15% A's, 30% B's, 40% C's, 10% D's, and 5% F's. Grades in her
most recent course were distributed as follows: $$\begin{array} { l | c | c | c | c | c } \text { Grade } & \text { A } & \text { B } & \text { C } & \text { D } & \text { F } \\\hline \text { Frequency } & 89 & 121 & 78 & 25 & 12\end{array}$$
a. Test an appropriate hypothesis to decide if the professor's most recent grade distribution
matches the historical distribution. Give statistical evidence to support your conclusion.
b. Which grade impacted your decision the most? Explain what this means in the context of
the problem.