Marketing companies have collected data implying that teenage girls use more ringtones on their cellphones than teenage boys do. In one particular study of 20 of each, the mean number of ringtones for the girls was 3.2 with a standard deviation of 1.5. The mean for the boys was 1.7 with a standard deviation of 0.8. Calculate a 95% confidence interval for the mean difference in ringtones between genders. Please write your answers to at least four decimal places. a. Critical value: t b. Degrees of freedom: c. Standard error: d. Point estimate: e. Margin of error: f. Confidence interval: < μα <

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