Suppose we would like to estimate the mean amount of money () spent on books by CS students in a semester. We have the following data from 10 randomly selected CS students: X-bar = $249 and S = $30. Assume that the amount spent on books by CS students is normally distributed. I estimate with 95% confidence that the true population mean is between ____________ and ________. Bags of a certain brand of tortilla chips claim have a net weight that vary slightly from bag to bag and are normally distributed with mean . A worker randomly selects 6 bags of chips and finds the sample mean to be X -bar = 13.82 and the sample standard deviation to be S = 0.24 I estimate with 95% confidence that the true population mean is between ____________ and ________. The time needed for college students to complete a certain maze follows a normal distribution. A group of nine college students complete the maze with a sample mean time of 49.2 seconds and sample standard deviation of 3.5 seconds. I estimate with 95% confidence that the true population mean is between ____________ and ________. Managers at a company complained that they spend too much time on paperwork. In a time use study 5 randomly selected managers were found to spend a mean time of 2.4 hours per day on paperwork, with a standard deviation of the 5 scores = 1.30 hours. I estimate with 95% confidence that the true population mean is between ____________ and ________. The wall thickness of 25 glass 2-liters bottles was measured by a quality control engineer. The sample mean was x - bar = 4.05 millimeters, and the sample standard deviation was s = 0.08 millimeters. I estimate with 95% confidence that the true population mean is between ____________ and ________