confidence interval for th 0.05 lation mean backpack we Therefore, the 1.96 Then, the 95% cor fidence interval for 1.96 Question 10 You measure 30 randomly selected textbooks' weights, and find they have a mean weight of 47 ounces. Assume the population standard deviation is 5 ounces. Based on this, construct a 95% confidence interval for the true population mean textbook weight Give your answers as decimals, to two places at 98% confidence le 2 2.326 hence