A loan officer compares the interest rates for 48month fixedrate auto loans and 48month variablerate auto loans. Two independent, random samples of auto loan rates are selected. A sample of five 48month variablerate auto loans had the following loan rates: 2 2.46% 3.91% 2.882% 3.23% 3 . 23% points while a sample of ve 483month fixedirate auto loans had loan rates as follows: 4.348% 3.78% 4.375% 3.71% 4.21% Figure 11.7 JMP Output of Testing the Equality of Mean Loan Rates for Variable and Fixed 48Honth Auto Loans Means and Std Deviations Level Nulber Mean Std Dev Fixed 5 4.62368 8.341878 Variable 5 2.95349 8.281149 t Test VariableFixed Assuming equal variances Difference 1.6726 t Ratio 5.41847 std Err Di'F 9.1989 DF 8 Upper CL Di'F 78.6161 Prob > ItI 9.99995 Lower CL Din: 1.5291 Prob > t 9.9997 Confidence 3.95 Prob o = (r 4392) e Reject 0 H0 wilhu = .05. lA