In an article in the Journal of Advertising , Weinberger and Spotts compare the

Question

In an article in the Journal of Advertising, Weinberger and Spotts compare the use of humor in television ads in the United States and the United Kingdom. They found that a substantially greater percentage of U.K. ads use humor.

Suppose that a random sample of 397 television ads in the United Kingdom reveals that 139 of these ads use humor. Find a point estimate of and a 95 percent confidence interval for the proportion of all U.K. television ads that use humor. (Round your answers to 3 decimal places.)

Suppose a random sample of 481 television ads in the United States reveals that 136 of these ads use humor. Find a point estimate of and a 95 percent confidence interval for the proportion of all U.S. television ads that use humor. (Round your answers to 3 decimal places.)

  The 95 percent confidence interval is [ , ].

round the ans don't give me wrong ans please

In an article in the Journal of Advertising, Weinberger and Spotts compare the use of humor in television ads in the United States and the United Kingdom. They found that a substantially greater percentage of U.K. ads use humor.

Explanation / Answer

Answer to the question is as follows:

1.

p^ = x/n = 139/397 = .3501
The 95% CI is given by :

p^ +/- Z*sqrt(p^*p^'/n)
=.350 +/- 1.96*sqrt(.3501*.6499/397)
= .303 to .397

2.
p^ = x/n = 136/481 = .2827
=.2827 +/- 1.96*sqrt(.2827*.7173/481)
= .2425 to .3230

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