Each person in a random sample of 221 male teenagers and a random sample of 302 female teenagers was asked how many hours he or she spent online in a typical week. The sample mean and standard deviation were 15.3 hours and 11.3 hours for males and 14.3 and 11.7 for females. (Use a statistical computer package to calculate the P-value. Use ?males − ?females. Round your test statistic to two decimal places, your df down to the nearest whole number, and your P-value to three decimal places.) t =   df =   P =

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Q: Multiple questions

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