Question 3 A car company wants to know the monthly sales made in ($000), based on the brand of vehicle. The data collected was entered on a MINITAB spreadsheet for analysis. Exhibit II below was...

Question 3

A car company wants to know the monthly sales made in ($000), based on the brand of vehicle. The data collected was entered on a MINITAB spreadsheet for analysis. Exhibit II below was subsequently generated.

 Exhibit 2

Model                 N          Mean            Median        Tri.Mean            Std Dev            S.E. Mean

Hyundai              23          109                  135            107.64                  *                      1.34
Toyota                27            165                124              143.65                9.5                      **

d) Assuming normality, construct and interpret a 90% confidence interval for the average monthly earning from Toyota Vehicles.