A survey of 66 randomly selected students finds that they spend a mean of $440 per semester. Assume that the population standard deviation is $53 per month. Confidence Interval: What is the 90% confidence interval to estimate the population mean? Round your answers to two decimal places. < μμ <
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A survey of 66 randomly selected students finds that they spend a
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- Standardized tests: In a particular year, the mean score on the ACT test was 19.7 and the standard deviation was 4.2. The mean score on the SAT mathematics test was 518 and the standard deviation was 103. The distributions of both scores were approximately bell-shaped. Round the answers to at least two decimal places. Find the z-score for an ACT score of 23. Find the z-score for a SAT score of 466.Fast-Food Bills for Drive-Thru Customers A random sample of 43 cars in the drive-thru of a popular fast food restaurant revealed an average bill of $16.14 per car. The population standard deviation is $5.51. Estimate the mean bill for all cars from the drive-thru with 97% confidence. Round intermediate and final answers to two decimal places. $ < μ < $Overweight Men For a random sample of 70 overweight men, the mean of the number of pounds that they were overweight was 32. The standard deviation of the population is 4.4 pounds. Part: 0 / 4 0 of 4 Parts Complete Part 1 of 4 (a) The best point estimate of the mean is how many pounds?
- find the estimsated standard deviationyou measure 26 textbooks weights and find they have a mean weight of 37 ounces. assume the population standard deviation is 9.1 ounces based on this construct a 90% confidence interval for the true population mean textbook weight. give your answers as decimals to two places ____________<u<___________Fast-Food Bills for Drive-Thru Customers A random sample of 40 cars in the drive-thru of a popular fast food restaurant revealed an average bill of $16.68 per car. The population standard deviation is $4.89. Estimate the mean bill for all cars from the drive-thru with 98% confidence. Round intermediate and final answers to two decimal places.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 <Hospital Noise Levels Noise levels at various area urban hospitals were measured in decibels. The mean noise level in 167 ward areas was s5.5 decibels, and the population standard deviation is 4.3. Find the 95% confidence interval of the true mean. Round your answers to at least one decimal place. O> >OHospital 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…Don't Hand writing solution.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. OSEE MORE QUESTIONSRecommended textbooks for youMATLAB: An Introduction with ApplicationsStatisticsISBN:9781119256830Author:Amos GilatPublisher:John Wiley & Sons Inc
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