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5. What sample size would we need to estimate the average amount of time U.S. adults watching election coverage with 99% confidence and a margin of error of + 7 minutes? Use z = 2.575. A) 321 U.S. Adults B) 108 U.S. Adults C) 157 U.S. Adults D) 243 U.S. Adults 6. Consider taking random samples of size 50 from Population A with proportion 0.88 and random samples of size 70 from Population B with proportion 0.81. Find the mean of the distribution of differences in sample proportions, PA - PB . A) - .07 B) .07 C) 1.07 D) .87 7. A random sample of 48 students at a large university reported getting an average of 6.5 hours of sleep on weeknights, with standard deviation 1.58 hours. A dotplot of the data is provided. 4.0 4.8 5.6 6.4 7.2 8.0 8.8 9.6 Weeknight Sleep It is recommended, for most college age students, to get 8 hours of sleep each night. Does this sample provide evidence, at the 5% level. that college students at this university get significantly less sleep, on average, than what is recommended? Use T Test. Answer True or False