11.You measure the weight of 37 turtles, and find theyhave a mean weight of 52 ounces. Assume the population standarddeviation is 10.9 ounces. Based on this, what is the maximal marginof error associated with a 92% confidence interval for the truepopulation mean turtle weight.
Give your answer as a decimal, to two places
12.In a survey, 18 people were asked how much they spenton their child's last birthday gift. The results were roughlyshaped as a normal curve with a mean of $45 and standard deviationof $8. Find the margin of error at a 80% confidencelevel.
13. In a survey, 20 people were asked how much theyspent on their child's last birthday gift. The results were roughlyshaped as a normal curve with a mean of $34 and standard deviationof $12. Construct a confidence interval at a 80% confidencelevel.
Give your answers to one decimal place.
.................. ± ..............
