According to a research study, American teenagers watched 14.8 hours of television per week last year, on average. A random sample of 11 American teenagers was surveyed and the mean amount of time per week each teenager watched television was 15.6. This data has a sample standard deviation of2.5. (Assume that the scores are normally distributed.) Researchers conduct a one-mean hypothesis test at the 5% significance level, to test if the mean amount of time American teenagers watch television per week is greater than the mean amount of time last year. (a) Ho : μ-14.8; Ha : μ > 14.8, which is a right-tailed test. (b) to 1.06 c) Using the partial ttable below, determine the critical value(s). If there is only one critical value, leave the second answer box blank. df o.10 0.05 0.025 . 0.005 9 1.383 1.8332.2622.821 3.250 10 1.372 1.812 2.228 2.764 3.169 11 1.363 1.7962.201 2.7183.106 12 1.356 1.782 2.179 2.68 3.055 13 1.350 1771 2.160 2.650 3.012

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