Assignment#3

Assignment#3 - Part I[Use the MPG data that you used for Assignment#2 a Summarize your model selection We chose to use a two-sample pooled variance

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Part I. [Use the MPG data that you used for Assignment #2.] a. Summarize your model selection. We chose to use a two-sample pooled variance with t because we have two samples, one for midsize cars and one for SUV’s and because we do not know the population variances. . We assumed that the samples are independent random samples. We used a Q-Q normal plot to determine that both the sample of midsize cars and SUV’s are approximately normal. Based on the results from the Stat Tools One-Variable Summary, we concluded that the variance of midsize cars is equal to the variance of SUV’s because the larger variance, 8.655, is not twice as large as the smaller variance, 8.258. Q-Q Normal Plot of MPG / Midsize Cars -3.5 -2.5 -1.5 -0.5 0.5 1.5 2.5 3.5 -3.5 -2.5 -1.5 -0.5 0.5 1.5 2.5 3.5 Z-Value Standardized Q-Value Q-Q Normal Plot of MPG / SUV's -3.5 -2.5 -1.5 -0.5 0.5 1.5 2.5 3.5 -3.5 -2.5 -1.5 -0.5 0.5 1.5 2.5 3.5 Z-Value

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MPG (Midsize) MPG (SUV) One Variable Summary Data Set #1 Data Set #1 Mean 26.750 20.105 Variance 8.258 8.655 Std. Dev. 2.874 2.942 Skewness 0.3632 0.8213 Kurtosis 2.2311 3.5584 Median 26.000 19.000 Mean Abs. Dev. 2.438 2.249 Minimum 22.000 15.000 Maximum 33.000 27.000 Range 11.000 12.000 Count 32 19 Sum 856.000 382.000 1st Quartile 24.000 18.000 3rd Quartile 28.000 22.000 Interquartile Range 4.000 4.000 b. Determine the 95% confidence interval to estimate the difference in mean miles per
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This note was uploaded on 02/16/2010 for the course BUS MGT 330 taught by Professor Schroeder during the Winter '08 term at Ohio State.

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Assignment#3 - Part I[Use the MPG data that you used for Assignment#2 a Summarize your model selection We chose to use a two-sample pooled variance

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