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Question: 1. A company has three task forces trying to meet a deadline for a new device. The groups work independently, with respective probabilities 0.8, 0.9, 0.75 of completing on time. What is the probability at least one group completes on time? (Think. Then solve "by hand.")
2. Two salesmen work differently. Roland spends more time with his customers than does Betty, hence tends to see fewer customers. On a given day Roland sees five customers and Betty sees six. The customers make decisions independently. If the probabilities for success on Roland's customers are 0:7; 0:8; 0:8; 0:6; 0:7 and for Betty's customers are 0:6; 0:5; 0:4; 0:6; 0:6; 0:4, what is the probability Roland makes more sales than Betty? What is the probability that Roland will make three or more sales? What is the probability that Betty will make three or more sales?
Smoking and sex. Wan, Friedman, Boutros, and Crawford (2008) studied a possible link between smoking and certain personality traits by sex.
Test the hypothesis that the respondents' borrowing habits are independent from what they believe their parents' attitudes to be.
In which of the following markets do all firms sell the same standardized product?
What was the intent of the Lobbying Disclosure Act of 1995?
If the number of recalls in a given month is above more than one standard deviation from the mean, the federal government issues a special warning directed toward parents. What is the probability that a special warning will be issued during a give..
For reservation purposes, the agency's management wants to ?nd the number of people such that the probability is 0.85 that at least that many people will sign up. It also needs 0.80 probability bounds on the number of people who will sign up for t..
Population blood pressure (BP) of patients is normally distributed, with a mean of 127, and standard deviation of 8. A random sample of 49 patients in the hospital found an average BP of 125.
Fully define construct-irrelevant variance. Be sure to include the main type of validity it is related to as well its effects on test scores. Incorporate Messick (1995) from your readings into your answer.
Find the evaluation score confidence intervals for the following two departments: Department 1 and Department 4 combined. Find the confidence interval at the 95% level. Use s = 6.06 and the mean 17.625.
the mean annual income of certified welders is normally distributed with a mean of 50000 and a population standard
Recalling that the coefficient of variation is determined by the ratio of the standard deviation over the mean, compute the coefficient of variation.
Using the 0.10 level of significance, is there evidence that the mean shopping time at the local supermarket is greater than the claimed value of 22 minutes?
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