11.You measure the weight of 37 turtles, and find they have a mean weight of 52...

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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.

.................. ± ..............

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11 SolutionGiven 52 Sample mean 109 Sample standard deviationn 37 Sample sizeNote that Population standard deviationis knownSo we use z distribution c 92 092 1 c 1 092 0082 008 2 004 See Answer

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