MAT 150 Special Assignment for Sections 7.1 and 7.2 1) When people smoke, the ni
ID: 3058501 • Letter: M
Question
MAT 150 Special Assignment for Sections 7.1 and 7.2
1) When people smoke, the nicotine they absorb is converted to cotinine, which can be measured. A random sample of 40 smokers has a mean cotinine level of 172.5. Assuming that is known to be 119.5, find a 94% confidence interval estimate of the mean cotinine level of all smokers. Write a sentence that interprets this interval.
2) You want to estimate the mean weight loss of people one year after following the Atkins diet. How many dieters must be surveyed if we want to be 95% confident that the sample mean weight loss is within 0.25 pound of the true population mean? Assume that the population standard deviation is known to be 10.6 lb.
3) A study was conducted to estimate hospital costs for accident victims who wore seat belts. Twenty randomly selected cases have a distribution that appears to be bell-shaped with a mean of $9004 and a standard deviation of $5629.
a) Construct the 99% confidence interval for the mean of all such costs and write a sentence that
Explanation / Answer
MAT 150 Special Assignment for Sections 7.1 and 7.2
1) When people smoke, the nicotine they absorb is converted to cotinine, which can be measured. A random sample of 40 smokers has a mean cotinine level of 172.5. Assuming that is known to be 119.5, find a 94% confidence interval estimate of the mean cotinine level of all smokers. Write a sentence that interprets this interval.
2) You want to estimate the mean weight loss of people one year after following the Atkins diet. How many dieters must be surveyed if we want to be 95% confident that the sample mean weight loss is within 0.25 pound of the true population mean? Assume that the population standard deviation is known to be 10.6 lb.
3) A study was conducted to estimate hospital costs for accident victims who wore seat belts. Twenty randomly selected cases have a distribution that appears to be bell-shaped with a mean of $9004 and a standard deviation of $5629.
a) Construct the 99% confidence interval for the mean of all such costs and write a sentence that
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