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AutoSave OFF NAE YC ... X : AutoLoan (3) v Home Insert Draw Page Layout >> ? Tell me L Share Com A ~ % " Conditional Formatting v Format as Table Clipboard Font Alignment Number Cells Cell Styles v Font A1 X V fx Variable-rate auto loans A B C D E Variable-rate auto loans Fixed-rate auto loans 2.60% 4.03% 3.07% 3.85% 2.87% 4.39% 6 3.24% 3.75% 3.15% 4.16% 9 0 N - 3 4A loan officer compares the interest rates for 48-month fixed-rate auto loans and 48-month variable-rate auto loans. Two independent, random samples of auto loan rates are selected. A sample of five 48-month variable-rate auto loans had the following loan rates: 2. 68 3. 078 2. 8728 3. 248 3. 158 while a sample of five 48-month fixed-rate auto loans had loan rates as follows: 4. 0328 3 . 858 4. 3858 3 . 758 4. 168 Click here for the Excel Data File FIGURE 11.7 JMP Output of Testing the Equality of Mean Loan Rates for Variable and Fixed 48-Month Auto Loans (for Exercise 11.12) Means and Std Deviations Level Number Mean Std Dev Fixed 4.03540 0.251785 Variable 2.98640 0.255176 t Test Variable-Fixed Assuming equal variances Difference -1.0490 t Ratio -6.54321 Std Err Dif 0.1603 DF 8 Upper CL Dif -0.6793 Prob > Itl 0.0002* Lower CL Dif -1.4187 Prob > t 0.9999 Confidence 0.95 Prob