In an article in the Journal of Advertising, Weinbergerand Spotts compare the use of humor in television ads in the UnitedStates and the United Kingdom. They found that a substantiallygreater percentage of U.K. ads use humor.
(a) Suppose that a random sample of 387television ads in the United Kingdom reveals that 130 of these adsuse humor. Find a point estimate of and a 95 percent confidenceinterval for the proportion of all U.K. television ads that usehumor. (Round your answers to 3 decimalplaces.)Ă‚Â Ă‚Â Ă‚Â
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| pˆp^ = |
| The 95 percent confidence interval is [,]. |
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(b) Suppose a random sample of 534 televisionads in the United States reveals that 114 of these ads use humor.Find a point estimate of and a 95 percent confidence interval forthe proportion of all U.S. television ads that use humor.(Round your answers to 3 decimal places.)
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| pˆp^ = |
| The 95 percent confidence interval is [,]. |
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(c) Do the confidence intervals you computed inparts a and b suggest that a greater percentageof U.K. ads use humor?
(Click to select)NoYes , the U.K. 95 percent confidence interval is(Click to select)abovenot above the maximum value
in the confidence interval for the U.S.
