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Lab Review Ch 9-11 The manager of the local Hamburger Express wishes to estimate the mean time customers spend at the drive-through window. A sample of 80 customers experienced a mean waiting time of 3.85 minutes, with a standard deviation of 0.65 minutes. Develop a 90 percent confidence interval for the mean walting time. (Round your answers to 4 declmal places.) 10 points Confidence interval is fromup to up to [ Book References Lab Review Ch 9-11 i John Kleman is the host of KXYZ Radio 55 AM drive-time news in Denver. During his morning program, John asks listeners to call n and discuss current local and national news. This morning, John was concerned with the number of hours children under 12 years of age watch TV per day. The last 5 callers reported that their children watched the following number of hours of TV last night. 10 2 5 6 7 4 points Calculate the sample mean and sample standard deviation. (Round your answers to 2 declmal places.) Book Sample mean Sample standard References deviation Would it be reasonable to develop a confidence interval from these data to show the mean number of hours of TV watched? (Click to select) , Since they are Click to select) not randomly randomly selected, it is |(Click to select) to use these data Lab Review Ch 9-11 3 The manufacturer of cell phone batteries wants to estimate the useful life of the battery (in thousands of hours). The estimate is to be within .06 (60) hours. Assume a 95 percent level of confidence and that the standard deviation of the useful life of the battery is 1.00 (1,000) hours. Determine the required sample size. (Round your answer to the next whole number.) 10 points Sample size eBook References Lab Review Ch 9-11 6 4 In a sample of 410 residents of Georgetown County, 145 reported they believed the county real estate taxes were too high. Develop a 95 percent confidence interval for the proportion of residents who belleve the tax rate is too high. (Round the p(proportlon) value to 2 declmal places and final answers to 3 decimal places.) 10 points Confidence interval for the proportion of residents is up to Would it be reasonable to conclude that the majority of the taxpayers feel that the taxes are too high? eBook (Click to select) References