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Q1: Is lack of sleep causing traffic fatalities? A study conducted under the auspices of the National Traffic Safety Administration found that the average number of fatal crashes caused by drowsy drivers was 1550. Assume the annual number of fatal crashes per year is normally distributed with a standard deviation of 300. What is the probability that the number of fatal crashes will be between 1000 and 2000 for a year?
Q2: For borrowers with good credit scores, the mean debt for revolving and installment accounts is $15,015. Assume the standard deviation is $3540 and that the debt amounts are normally distributed. What is the probability that the debt for a randomly selected borrower with good credit is between $12,000 and $18,000
do males and females differ in the amounts they spend on valentines day? the average expenditure in a sample of 40 male
During the 2000 season, the home team won 138 of the 240 regular season National Football League games. Is this strong evidence of a home field advantage in professional football
Testing for defectives. Suppose a lot of 5 items contains two defective items. The items are tested one by one in random order.
In a regression analysis, if a new independent variable is added and R-squared increases and adjusted R-squared decreases precipitously, what can be concluded?
Super Markets, Inc. is considering expanding into the Scottsdale, Arizona, area. Ms. Luann Miller, Director of Planning, must present an analysis of the proposed expansion to the operating committee of the board of directors
1. Which of the following are valid probability density functions? Justify your answer.
Richwood Products buys parts from Staple Brothers machining. The engineers at Richwood want to ensure that the parts purchased meet their company's standards.
A prominent social scientist describes the process of choosing a model specification as follows.
Let X (t) be a wide sense stationary random process that is ergodic in mean and the autocorrelation.- Show that Y(t) is not ergodic in the mean or the autocorrelation.
Suppose that 20% of the homes in a neighborhood has a swimming pool in their backyards and 50% has a garage. 15% of homes have both a garage and a swimming pool.
I hypothesized that girls in my class have the same blood pressure levels as boys. The probability value for my null hypothesis was 0.15. So I conclude that the blood pressures of the girls were higher than boys'. Which kind of mistake did I make?
the f.s. supplies company buys calculators from a japanese supplier. the probability of a defective calculator is 20.
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