3. A 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. Use the excel file on moodle. Assume unequal population variances. Set up the null and alternative hypotheses needed to determine whether the mean rates for 48-month variable-rate and fixed-rate auto loans differ. One tailed or two tailed test? Qa. one-tailed Ob. two-tailed Continuing with the previous question, what's the test statistic? 2 decimal places is fine. Answer: