10.2

a. Estimate the mean credit card debt for freshmen with a 95% confidence interval.

b. Does the sampled population of sophomores have a significantly higher credit card debt than the national average reported by Nellie Mae? Use 0.05.

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FIGURE 10.1 "Road Map" to Two Population Inferences Start Does the Inference Concem Means? Yes What Kind of Samples? Dependent Uses Student's I-distribution Section 10.3 No Section 10.2 Independent Does the Inference Concem Proportions? No Yes Does the Inference Concern Variances or Yes Standard Deviations? Uses Student's 1-distribution Section 10.4 Uses standard normal z Section 10.5 Uses standard F-distribution Section 10.6