(1 point) Randomly selected 2020 student cars (population 1) have ages with a mean of 7.97.9...

(1 point) Randomly selected 2020 student cars (population 1) have ages with a mean of 7.97.9 years and a standard deviation of 3.63.6 years, while randomly selected 2222 faculty cars (population 2) have ages with a mean of 5.55.5 years and a standard deviation of 3.53.5 years. (For the purposes of this exercise, the two populations are assumed to be normally distributed.)

1. Use a 0.010.01 significance level to test the claim that student cars are older than faculty cars.
The test statistic is
The P-value (using the n1+n2-2 degrees-of-freedom) is
Is there sufficient evidence to support the claim that student cars are older than faculty cars?

A. Yes
B. No

2. Construct a 9999% confidence interval estimate of the difference μ1−μ2μ1−μ2, where μ1μ1 is the mean age of student cars and μ2μ2 is the mean age of faculty cars. (Use the using the n1+n2-2 degrees-of-freedom formula). <(μ1−μ2)<<(μ1−μ2)<

Expert Solution

orchestra answered 2 years ago

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