Population Mean Inference

Data Summary

Variable Sample Size Mean Sample Std Dev
Domestic MPG 35 33 10
Import MPG 47 34 9

t-Based Confidence Interval

95% Confidence interval
Assumed unequal variances for variables

Variable Midpoint Std Error DF Lower CL Upper CL Margin of Error
Domestic MPG - Import MPG -1 2.14022 68.8674 -5.26977 3.26977 4.26977

Normal-Based Confidence Interval

95% Confidence interval
Assumed unequal variances for variables

Variable Midpoint Std Error Lower CL Upper CL Margin of Error
Domestic MPG - Import MPG -1 2.14022 -5.19476 3.19476 4.19476