Question 12 8 pts 1 Details You measure 25 textbooks' weights, and find they have a mean weight of 63 ounces. Assume the population standard deviation is 9.9 ounces. Based on this, construct a 95% confidence interval for the true population mean textbook weight. Give your answers as decimals, to two places Question 13 7 pts 1 Details You measure 26 watermelons' weights, and find they have a mean weight of 72 ounces. Assume the population standard deviation is 10.6 ounces. Based on this, construct a 99% confidence interval for the true population mean watermelon weight. Give your answers as decimals, to two places ounces Calculator Check Answer Question 14 4 pts 1 Details You measure 41 turtles' weights, and find they have a mean weight of 45 ounces. Assume the population standard deviation is 6.2 ounces. Based on this, what is the maximal margin of error associated with a 90% confidence interval for the true population mean turtle weight. Give your answer as a decimal, to two places Calculator Check Answer ounces Question 15 4 pts 1 Details An engineer wishes to determine the width of a particular electronic component. If she knows that the standard deviation is 2.1 mm, how many of these components should she consider to be 90% sure of knowing the mean will be within 0.6 mm? 21 O 147 21 34 Calculator Check Answer