A Calculus Instructor Is Interested in Finding the Strength of a Relationship

Essay

A calculus instructor is interested in finding the strength of a relationship between the final exam grades of
students enrolled in Calculus I and Calculus II at his college. The data (in percentages)are listed below. $$\begin{array} { l | c | c | c | c | c | c | c | c | c | } \text { Calculus I } & 88 & 78 & 62 & 75 & 95 & 91 & 83 & 86 & 98 \\\hline \text { Calculus II } & 81 & 80 & 55 & 78 & 90 & 90 & 81 & 80 & 100\end{array}$$ a)Graph a scatter plot of the data.
b)Find an equation of the regression line.
c)Determine if there is a significant correlation between the data. Use $\alpha$ = 0.01.
d)Predict a Calculus II exam score for a student who receives an 80 in Calculus I. Is your answer a valid
prediction?