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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 95% confidence interval for the percentage of all auto accidents that involve teenage drivers.
b) Explain what your interval means.
c) Explain what 95% 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.
If n = 10 observations are randomly sampled from a distribution with mean µ = 9 and variance σ 2 = 8, what is the mean and variance of the sample mean?
1. an international marketer has said when political instability increases the price of quality increases. think about
If there are 75 students in the class, what is the probability the professor needs more than 6 hours to mark all of the midterms?
Calculate the standard deviation of the number of available rooms in that sample. Use the central limit theorem to calculate and identify the sampling distribution of the sample mean.
The average stock price for companies making up the S&P 500 is $40, and the standard deviation is $10. Assume the stock prices are normally distributed. What is the probability a company will have a stock price less than $33.
Suppose n unrelated people are gathered together. What is the smallest n for which chances are >50% that there will be two or more people born in the same calendar month?
An airplane manufacturer currently produces six models of airplanes for commercial sale. the airline that lauren works for is rapidly expanding and would like to purchase three airplanes of different models to service various routes.
question correlation and regression analysisthe owner of a financial services firm believes that there is a
It is claimed that 70% of the residents in a large town approve of the current zoning law. Four residents are to be randomly selected. Find the probability that:
The normal range for cholesterol for an adult is 120 - 240mg/dl. A study found that the total cholesterol level for American adults has a mean of 159.2mg/dl and 84.1 of adults have a cholesterol level below 200mg/dl. Determine the standard deviati..
You want to estimate today's mean temperature, so you make a series of measurements (taken as a sample) throughout the day. The mean of these measurements is 63 degrees Fahrenheit, and their standard deviation is 3.4 degrees Fahrenheit.
Draw a tree diagram to show all possible outcomes of the experiment. Label the probability associated with each stage of the experiment on the appropriate branch.
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