MAT 150 Special Assignment for Sections 7.3 and 7.4 1) An insurance company chec
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Question
MAT 150 Special Assignment for Sections 7.3 and 7.4 1) An insurance company checks police records on 582 accidents selected at random and notes that teenagers were at the wheel in 91 of them. Create a 98% confidence interval for the percentage of all auto accidents that involve teenage drivers and write a sentence that interprets the interval. A politician urging tighter restrictions on drivers’ licenses issued to teens says, “In one of every five auto accidents, a teenager is behind the wheel.” Does your confidence interval support or contradict this statement? Explain. 2) Many states are carefully considering steps that would help them collect sales tax on items purchased through the Internet. How many randomly selected sales transactions must be surveyed to determine the percentage that transpired over the Internet? Assume that we want to be 99% confident that the sample percentage is within two percentage points of the true population percentage for all sales transactions. 3) Construct a 99% confidence interval estimate for the true standard deviation of body temperatures of all healthy adults, if a random sample of 101 healthy adults had a standard
Explanation / Answer
MAT 150 Special Assignment for Sections 7.3 and 7.4 1) An insurance company checks police records on 582 accidents selected at random and notes that teenagers were at the wheel in 91 of them. Create a 98% confidence interval for the percentage of all auto accidents that involve teenage drivers and write a sentence that interprets the interval. A politician urging tighter restrictions on drivers’ licenses issued to teens says, “In one of every five auto accidents, a teenager is behind the wheel.” Does your confidence interval support or contradict this statement? Explain. 2) Many states are carefully considering steps that would help them collect sales tax on items purchased through the Internet. How many randomly selected sales transactions must be surveyed to determine the percentage that transpired over the Internet? Assume that we want to be 99% confident that the sample percentage is within two percentage points of the true population percentage for all sales transactions. 3) Construct a 99% confidence interval estimate for the true standard deviation of body temperatures of all healthy adults, if a random sample of 101 healthy adults had a standard
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