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Day Care Tuition A random sample of 47 four-year-olds attending day care centers provided a yearly tuition average of $3966 and the population standard deviation of $636
Find the 99% confidence interval of the true mean. Round your answers to the nearest whole number
. < μ <
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Round intermediate and final answers to two decimal places.Fast-Food Bills for Drive-Thru Customers A random sample of 50 cars in the drive-thru of a popular fast food restaurant revealed an average bill of $19.19per car. The population standard deviation is $6.30. Estimate the mean bill for all cars from the drive-thru with 91% confidence. Round intermediate and final answers to two decimal places. Question $____<U< $______Hospital Noise Levels Noise levels at various area urban hospitals were measured in decibels. The mean of the noise levels in 36 randomly selected corridors was 61.2 decibels, and the standard deviation of the population was 7.3. Find the 99% confidence interval of the true mean. Round your answers to one decimal place. <μ <Number of Jobs A sociologist found that in a sample of 49 retired men, the average number of jobs they had during their lifetimes was 6.8 . The population standard deviation is 2.4 . Use a graphing calculator and round the answers to one decimal place. Part: 0 / 4 0 of 4 Parts Complete Part 1 of 4 The best point estimate of the mean is . ??Hospital Noise Levels Noise levels at various area urban hospitals were measured in decibels. The mean noise level in 170 ward areas was 51.6 decibels, and the population standard deviation is 5.2. Find the 95% confidence interval of the true mean. Round your answers to at least one decimal place.Most people think that the "normal" adult body temperature is 98.6degrees°F. In a more recent study, researchers reported that a more accurate figure may be 98.198.1degrees°F. Furthermore, the standard deviation appeared to be around 0.60.6degrees°F. Assume that a Normal model is appropriate. Complete parts a through c below. Question content area bottom Part 1 a) In what interval would you expect most people's body temperatures to be? Explain. Select the correct choice below and fill in the answer box(es) to complete your choice. A. Using the 68-95-99.7 Rule, about 95% of the body temperatures are expected to be less than enter your response heredegrees°F. (Round to one decimal place as needed.) B. Using the 68-95-99.7 Rule, about 95% of the body temperatures are expected to be between enter your response heredegrees°F and enter your response heredegrees°F. (Use ascending order. Round to one decimal place as needed.) C. Using the…Hospital Noise Levels Noise levels at various area urban hospitals were measured in decibels. The mean noise level in 167 ward areas was 51.2 decibels, and the population standard deviation is 5.5. Find the 95% confidence interval of the true mean. Round your answers to at least one decimal place. ORecommended textbooks for youMATLAB: An Introduction with ApplicationsStatisticsISBN:9781119256830Author:Amos GilatPublisher:John Wiley & Sons IncProbability and Statistics for Engineering and th…StatisticsISBN:9781305251809Author:Jay L. 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