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For a population, the value of the standard deviation is 2.51. A random sample of 35 observations taken from this population produced the following data. Roind your answers to 2 decimal places. a. What is the point estimate of  ? b. Aake-a 96% confidence interval for 11 . to c. What is the margin of error of estinate for part b?
A random sample of 11 observations taken from a normally distributed population produced the following data: −7.110.38.9−3.6−5.6−7.65.33.59.9−4.56.3 Round your answers to 2 decimal places. a. What is the point estimate of μ ? b. Make a 95% confidence interval for μ. to c. What is the mangin of error of estimate for μ in part b?
A company randomly selected nine office employees and secretly monitored their computers for one month. The times (in hours) spent by these employees using their computers for non-job-related activities (playing games, personal communications, etc.) during this month are given below. Assuming that such times for all employees are normally distributed, make a 95% confidence interval for the corresponding population mean for all employees of this company. Round your answers to two decimal places.