Stats 10 Quiz #7b

Stats 10 Quiz #7b - 1. A manufacturer of balloons claims...

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1. A manufacturer of balloons claims that p, the proportion of its balloons that burst when inflated to a maximum diameter of 12 inches, is no more than 0.05. Some customers complained that the balloons are bursting more frequently. If the customers want to conduct an experiment to test the manufacturer’s claim, which of the following hypotheses would be appropriate? a. Ho: p > 0.05 and Ha: p = 0 b. Ho: p = 0.05 and Ha: p > 0.05 2. John has just started a tutoring agency. He decides to take a risk and place a large ad in the Sunday issue of the L.A. Times and hopes that the name recognition is worth the high cost of the ad. He hopes that at least 40% of the neighborhood will recognize the ad. On Monday he contacts 125 randomly selected households who receive the LA Times and he finds that 56 of them had noticed the ad. Would you recommend that John continue to place the ad in the Sunday edition of the L.A. Times? a. Do not put ads in the Sunday Times. Since the p-value is fairly high, we fail to reject the null and there is little evidence that more than 40% of the neighbors recognize the ad b. Do not put ads in the Sunday Times. Since the p-value is small, we fail to reject the null. There is little evidence that more than 40% of the neighbors recognize the ad c. Do not place ads in the Sunday Times. In order to spend this kind of money you want to make sure that more than 40% of readers notice the ad d. Do not put ads in the Sunday Times. The sample size is not large enough to make such a conclusion; the data are not stable 3. A researcher is examining the impact of a new method of teaching a foreign language. He concluded that the new method is significantly better than the old method, based on a test using alpha = 0.05 a. We need the standard error and the sample mean to decide if the new method was better
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This note was uploaded on 04/09/2008 for the course STATS 10 taught by Professor Ioudina during the Winter '08 term at UCLA.

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Stats 10 Quiz #7b - 1. A manufacturer of balloons claims...

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