The following Excel scatterplot with the fitted quadratic regression equation illustrates the observed relationship between productivity and the number of hired workers. Assuming that the number of hired workers must be integer,how many workers should be hired to achieve the highest productivity?
A) 26
B) 28
C) 30
D) 32

Question

The following Excel scatterplot with the fitted quadratic regression equation illustrates the observed relationship between productivity and the number of hired workers.  Assuming that the number of hired workers must be integer,how many workers should be hired to achieve the highest productivity?
A) 26 
B) 28 
C) 30 
D) 32

Quizplus · Accepted Answer

Looking at the graph, we can see that the curve peaks at about x=29. However, since the number of hired workers must be an integer, the closest integer value to 29 is 30, which is the answer choice C.

The Following Excel Scatterplot with the Fitted Quadratic Regression Equation