An insurance company checks police records on 582 accidents selected at random and notes that teenagers were at the wheel in 91 of them. a) Create a 98% confidence interval for the percentage of all auto accidents that involve teenage drivers. b) Explain what your interval means. c) Explain what "98% confidence" means. d) 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.

An insurance company checks police records on 582 accidents selected at random and notes that teenagers were at the wheel in 91 of them.

Explain what your interval means.

An insurance company checks police records on 582 accidents selected at random and notes that teenagers were at the wheel in 91 of them.

Explain what "95% confidence" means.

What is the probability of rolling a prime number of dots with a fair, six-sided die numbered one through six?

Use your Normal model to answer these questions. a) In what interval would you expect the central 95% of IQ scores to be found? b) About what percent of people should have IQ scores below 84? c) About what percent of people should have IQ scores above 132?

Write a program that finds all prime numbers up to 10,000,000,000. There are approximately 455,052,511 such prime numbers. Your program should meet the following requirements: - Your program should store the prime numbers in a binary data file, named PrimeNumbers.dat. When a new prime number is found, the number is appended to the file. - To find whether a new number is prime, your program should load the prime numbers from the file to an array of the long type of size 10000. If no number in the array is a divisor for the new number, continue to read the next 10000 prime numbers from the data file, until a divisor is found or all numbers in the file are read. If no divisor is found, the new number is prime. - Since this program takes a long time to finish, you should run it as a batch job from a UNIX machine. If the machine is shut down and rebooted, your program should resume by using the prime numbers stored in the binary data file rather than start over from scratch.

A magazine is considering the launch of an online edition. The magazine plans to go ahead only if it's convinced that more than 25% of current readers would subscribe. The magazine contacted a simple random sample of 500 current subscribers, and 137 of those surveyed expressed interest. What should the company do? Test an appropriate hypothesis and state your conclusion. Be sure the appropriate assumptions and conditions are satisfied before you proceed.

A TV newscaster reports the results of a poll of voters, and then says, "The margin of error is plus or minus 4%." Explain carefully what that means.

Write a program that simulates a traffic light. The program lets the user select one of three lights: red, yellow, or green. When a radio but ton is selected, the light is turned on. Only one light can be on at a time. No light is on when the program starts.

Wildlife biologists inspect 153 deer taken by hunters and find 32 of them carrying ticks that test positive for Lyme disease.

What concerns do you have about this sample?

A TV newscaster reports the results of a poll of voters, and then says, “The margin of error is plus or minus 4%.” Explain carefully what that means.

Wildlife biologists inspect 153 deer taken by hunters and find 32 of them carrying ticks that test positive for Lyme disease. What concerns do you have about this sample?

Choose the best answer. What made the cleanup of Chesapeake Bay difficult? I. The companies that polluted it were no longer in business. II. The bay's watershed is large and encompasses several states. III. Tides and currents impeded the cleanup work. (a) I only (b) II only (c) III only (d) I and II

Wildlife biologists inspect 153 deer taken by hunters and find 32 of them carrying ticks that test positive for Lyme disease. If the scientists want to cut the margin of error in half, how many deer must they inspect?