a. A vaccination exercise carried out using a drive through service finds that 38 out of 62 vehicles were served within the expected serving time. i) Construct and interpret a 99% confidence interval for the proportion of vehicles served within the expected time. ii) At the same confidence level, determine what sample size is needed if the margin of error E = 0.10.
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- A study of 420,092 cell phone users found that 134 of them developed cancer of the brain or nervous system. Prior to this study of cell phone use, the rate of such cancer was found to be 0.0322% for those not using cell phones. Complete parts (a) and (b). a. Use the sample data to construct a 95% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system. %A study determined that 60% of women older than age 50 have annual mammograms. A researcher believes that the 60% rate is no longer valid and the proportion should be higher. To see if this proportion is still valid, he surveys 100 women, 75 of whom say they have annual mammograms. if a=0.05, caculate the sample proportion, confidence interval, margin of error, and p value.The International Air Transport Association surveys business travelers to develop quality ratings for transatlantic gateway airports. The maximum possible rating is 10. Suppose a simple random sample of 50 business travelers is selected and each traveler is asked to provide a rating for the Miami International Airport. The ratings obtained from the sample of 50 business travelers follow. 9 1 1 1 8 8 8 9 1 8 9 8 1 8 8 7 7 5 8 4 9 8 9 1 1 7 7 Develop a 95% confidence interval estimate of the population mean rating for Miami. Round your answers to two decimal places. 4 7 6 8 8 4 I 10 10 1 1 8 7 8 8 10 7 9 7 8 1 6 10 7A study of 420,082 cell phone users found that 136 of them developed cancer of the brain or nervous system. Prior to this study of cell phone use, the rate of such cancer was found to be 0.0415% for those not using cell phones. Complete parts (a) and (b). a. Use the sample data to construct a 90% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system. %The Salesforce company of a unicorn has various clients associated .The company wants to estimate the proportion of its clients who are associated with more than one company. A random sample of 600 clients is selected without replacement and 125 say that they are associated with more than one company .a. Construct a 99% confidence interval estimate of the population proportion of the clients who have been associated with more than one companyA public health official in Okeechobee county needs to estimate the average diastolic blood pressure of all residents in Okeechobee county for a report that is being prepared for the Florida Department of Health.The official randomly selected 128 Okeechobee county residents and found that the mean diastolic blood pressure of the sample was 74 millimeters of mercury (mm Hg).Using a 98% confidence level, determine the margin of error, EE, and a confidence interval for the mean diastolic blood pressure of all Okeechobee county residents. From past research, it is known that the standard deviation of the distribution of all Okeechobee county residents' diastolic blood pressure is 5 mm Hg.Report the confidence interval using interval notation. Round solutions to two decimal places, if necessary.The margin of error is given by E=A 98% confidence interval is given byA study of 420,031 cell phone users found that 136 of them developed cancer of the brain or nervous system. Prior to this study of cell phone use, the rate of such cancer was found to be 0.0316% for those not using cell phones. Complete parts (a) and (b). a. Use the sample data to construct a 90% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system. %In a survey of 813 human resource professionals concerning challenges they faced in the workplace, 321 said that employee retention was an important challenge and 194 said that employee satisfaction was an important challenge. the 95% confidence interval estimate for the population proportion isA study of 420,039 cell phone users found that 131 of them developed cancer of the brain or nervous system. Prior to this study of cell phone use, the rate of such cancer was found to be 0.0443% for those not using cell phones. Complete parts (a) and (b). ..... a. Use the sample data to construct a 95% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system. • D%1. At the 95% confidence what is the margin of error? 2. Determine a 95% confidence interval estimate for the mean weight of the carry on luggageA study of 420,097 cell phone users found that 137 of them developed cancer of the brain or nervous system. Prior to this study of cell phone use, the rate of such cancer was found to be 0.0311% for those not using cell phones. Complete parts (a) and (b). .... a. Use the sample data to construct a 90% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system. %3) Find only the margin of error to construct a 98% confidence interval for p1 - P2. 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