Question

you know that th 100, at the b. Repeat part (a) assuming that ulation standard deviation is ơ the conclusions produced (a) assuming that you know that the n standard deviation is ơ 3( In art c. Explain why arts (a) and (b) are virtually identical, the interval estimate produced in narrower than that in part (a). why ling 1,000 membersofa normal popula- Applications nd 15,500 ands 9,950. Estimate The following ea d manually or with the d in files. Assume that may computer. The data are stored in files. Asszm mean with 90% confidence- standard deviation is σ-: 9,950 the interval estimates were virtually 12.23 Xr12-23 A courier service advertises that assistance ing that you know that the tbe mndom variable is normally distributed its average random sample of times for 12 deliveries to an add. across town was recorded. These data are sh Is this sufficient evidence to support the advertisement, at the 5% level of significance? y delivery time is less than 6 hours for local delive ress own sample of 500 observations drawn courier's m nal dard deviation were calculated as ation, the sample mean and 3.03 6.33 6.50 5.22 3.56 6.76 7.98 4.82 7.96 4.54 5.09 6.46 d 100. Estimate the population s con (a) assuming that you know that the tandard deviation is 100 12.24 Xr12-24 How much money do winners go ho with from the television quiz show Jeopardy? To determine an answer, a random sample of winners was drawn; the recorded amount of money each won is listed here. Estimate with 95% confidence the interval estimates were virtually mple of 11 observations was taken al population. The sample mean deviation are at the 5% significance level that n mean is greater than 70? assuming that you know that the ndard deviation is 74.5 and s9 the mean winnings for all the show's players 26,650 6,060 52,820 8,490 13,660 25,840 49,840 23,790 51,480 18,960 990 11,450 41,810 21,060 7,860 90 the conclusions produced in 12.25 xr1225 A diet doctor claims that the average North American is more than 20 pounds overweight. To tes his claim, a random sample of 20 North Americans actitioner randomly sampled 10 nd found 103 and s 17. Is evidence at the 10% significance de that the population mean is as weighed, and the difference between their actual and ideal weights was calculated. The data are listed here, Do these data allow us to infer at the 5% assuming that you know that the dard deviation is σ th significance level that the doctor's claim is true? 16 23 18 41 22 18 23 19 22 15 18 35 16 15 17 19 23 15 16 26 17 e conclusions produced in 12.26 Xr12:26 A federal agency responsible for enforc- er itioner randomly sampled 1,500 found 14 and s 25. Test ether there is enough evidence ficance level to infer that the ing laws governing weights and measures routinely inspects packages to determine whether the weight of the contents is at least as great as that advertised on the package. A random sample of 18 contain- rs whose packaging states that the contents weigh 8 ounces was draun suming that

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