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...

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

1. Determine the values of
   *
   and
   **. [2]


2. Give the unbiased point estimate for the average monthly earning from Hyundai

1. Give the unbiased point estimate for the variance of monthly earning from Hyundai

1. Assuming normality, construct and interpret a 90% confidence interval for the average monthly earning from Toyota [3]


2. You are required to test at the 5% level of significance the hypothesis that the average monthly earnings on Hyundai Vehicles is equal to $110,000 versus the alternative that it is different from $110,000.

Complete the following:

1. Give the null and alternative hypothesis of this


2. Determine the critical value(s) of this

• Compute the value of the test

1. State the decision


2. Give your decision based on the available sample


3. Hence, state your