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Is lack of sleep causing traffic fatalities? A study conducted under the auspices of the National Highway Traffic Safety Administration found that the average number of fatal crashes caused by drowsy drivers each year was 1,550 (Business Week, January 26, 2004). Assume the annual number of fatal crashes caused by drowsy drivers per year is normally distributed with a standard deviation of 320.
What is the probability of fewer than 1,000 fatal crashes in a year (to 4 decimals)?
What is the probability the number of fatal crashes will be between 1,000 and 2,000 for a year (to 4 decimals)?
For a year to be in the upper 5% with respect to the number of fatal crashes, how many fatal crashes would have to occur (to 1 decimal)?
Construct a 99% confidence interval for the mean bill of a customer. A) [31.355, 32.645] B) [29.747, 34.253] C) [29.421, 34.579] D) [29,740, 34.260] E) [28.570, 35.570].
sample methods identify which of the following applies simple random systematic conveniencestratified or cluster sample
For a population with a mean of 60 and a standard deviation of 24, find the z-score corresponding to each of the following samples. What is Om for each equation?
State the hypotheses for a chi-squared test in the context of this problem. Calculate the expected matrix and describe what it represents. Calculate the test statistic. Describe what this represents and answer the question posed.
Suppose we wish to test the null hypothesis that there are no differences among the proportion of men and women who developed a rash. Evaluate the P-value of the chi-square test of this hypothesis.
Assume you are the manager of a paint manufacturing factory. Your company has received complaints from customers that the containers hold less than the amount printed on them.
a recent poll asked a random sample of 1012 u.s. adults what they do with the milk in the bowl after they have eaten
Assume the variable is normally distributed. If an individual is selected, find the probability that the individual's pressure will be between 120 and 121.8 mmHg.
Given that the average monthly amount charged is uniformly distributed, what percent of monthly charges are between $100 and $1100?
Consider the trash bag problem. Suppose that an independent laboratory has tested trash bags and has found that no 30-gallon bags that are currently on the market have a mean breaking strength of 50 pounds or more.
in a series of 40 payments the first 10 payments are 10 each the second 10 payments are 20 each the third 10 payments
Determine the typical seasonal patterns for sales using the ratio-to-moving-average method. Project the sales for 2004, and then seasonally adjust each quarter.
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