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 Toyota 23 109 135 107.64 1.34 27 165 124 143.65 9.5 ** c) Give the unbiased point estimate for the variance of monthly earning from Hyundai Vehicles. d) Assuming normality, construct and interpret a 90% confidence interval for the average monthly earning from Toyota Vehicles.

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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
Мean
Median
Tri.Mean
Std Dev
S.E. Mean
Hyundai
Тoyota
23
109
135
107.64
*
1.34
27
165
124
143.65
9.5
**
c) Give the unbiased point estimate for the variance of monthly earning from Hyundai Vehicles.
d) Assuming normality, construct and interpret a 90% confidence interval for the average
monthly earning from Toyota Vehicles.
Transcribed Image Text: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 Мean Median Tri.Mean Std Dev S.E. Mean Hyundai Тoyota 23 109 135 107.64 * 1.34 27 165 124 143.65 9.5 ** c) Give the unbiased point estimate for the variance of monthly earning from Hyundai Vehicles. d) Assuming normality, construct and interpret a 90% confidence interval for the average monthly earning from Toyota Vehicles.
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