Questions 5,6

#5: A researcher wishes to estimate the average blood alcohol concentration (BAC) for drivers involved in fatal accidents who are found to have positive BAC values. He randomly selects records from 65 such drivers in 2009 and determines the sample mean BAC to be 0.105 g/dL with a standard deviation of 0.03 g/dL. Determine and interpret a 99% confidence interval for the mean BAC in fatal crashes in which the driver had a positive BAC. #6: The following data represent the age (in weeks) at which babies first crawl based on a survey of 10 mothers. The data are normally distributed. Construct and interpret a 90% confidence interval for the population standard deviation of the age (in weeks) at which babies first crawl. 22 45 30 41 20 37 50 25 39 a) Construct a 90% confidence interval for of if the sample size, n, is 9. Show formula and round up your answer. b) Construct a 90% confidence interval for o if the sample size, n, is 9. Show formula and round up your