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Super Bowl commercials
When spending large amounts to purchase advertising time, companies want to know what audience they'll reach. In January 2007, a poll asked 1008 American adults whether they planned to watch the upcoming Super Bowl. Men and women were asked separately whether they were looking forward more to the football game or to watching the commercials. Among the men, 16% were planning to watch and were looking forward primarily to the commercials. Among women, 30% were looking forward primarily to the commercials.
a) Was this a stratified sample or a blocked experiment? Explain.
b) Was the design of the study appropriate for the advertisers' questions?
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Computing from a large sample, one finds the 95% confidence interval for 956; to be {6.8, 14.2}. Based on this information alone, determine the 90% confidence interval for 956
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Fully investigate the hypothesis that DVD revenues are larger on average when the box office revenue is in excess of $100 million. State all required assumptions, indicate your chosen level of significance (and why you chose it) and give a plain-E..
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Crude oil is pumped at a rate of 100,138 kg/h from a point 255 meters below the earth's surface to a point 30 meters above ground level. Calculate the attendant rate of increase of potential energy in kW.
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