Length of Growing Seasons The growing seasons for a random sample of 44 U.S. cities were recorded, yielding a sample mean of 188.9 days and the population standard deviation of $5.9 days. Estimate the true population mean of the growing season with 99% confidence. Round your answers to at least one decimal place. X 5Gasoline Use A random sample of 25 drivers used on average 755 gallons of gasoline per year. The standard deviation of the population is 29 gallons. Part: 0 / 2 Part 1 of 2 (a) Find the 95% confidence interval of the mean for all drivers. Round intermediate answers to at least three decimal places. Round your final answers to the nearest whole number. XUndergraduate GPAs It is desired to estimate the mean GPA of each undergraduate class at a large university. How large a sample is necessary to estimate the GPA within 0.27 at the 95% confidence level? The population standard deviation is 1.26. If needed, round your final answer up to the next whole number. olo The university needs at least a sample of students. X 5Indy 500 Qualifier Speeds The speeds In miles per hour of SIX randomly selected qualifiers for the Indianapolis 500 (in 2012) are listed below. Estimate the mean qualifying speed with 90% confideme. Round your answers to at least four decimal planes. 226.484 225.172 222.929 226.240 222.891 224.037 Send data lo Excel Work Time Lost due to Accidents At a large company, the Director of Research found that the average work time lost by employees due to aCCidents was 95 hours per year. She used a random sample of 23 employees. The standard dewation of the sample was 5.1 hours Estimate the population mean for the number of hours lost due to accidents for the companyr using a 90% confidence interval. Assume the variable is normally distributed. Round intermediate answers to at least three deCImal places. Round your final answers to the nearest whole number. HUI]