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A researcher determines that students study an average of 60 15 (M SD) minutes per week. Assuming these data are normally distributed, what is the z score for students studying 45 minutes per week?
What is a significance level? What is the largest significance level you can use without giving a justification?
The useful life of an electrical component is exponentially distributed with a mean of 2,500 hours. What is the probability the circuit will last more?
What is the probability that at least three students choose Supreme Chocolate?
a restaurant owner claims the percentage of his customer distribution is monday 10 tuesday 12 wednesday 10 thursday 15
Mr. Pickwick takes his umbrella. When rain is not forecast, he takes it with probability 1/3. Find: (a) the probability that Pickwick has no umbrella, given that it rains.
In what height interval must the company expect to determine middle 70% of kindergarteners?
A real number X is randomly chosen from the interval [0,10], dividing the interval into a left and a right side. Find the probability that the left side is at least four times as big as the right.
If the class does well on an exam, then the next exam is equally likely to be any of the three types. If the class does badly, then the next exam is always type 1. What proportion of exams are type 1, 2, and 3?
Simplify the arithmetic by first subtracting 80 points from each score to obtain a new sample of 2, 8, 2, and 6. Then, compute the mean and standard deviation for the new sample.
Explain the major differences between cash flows for replacement (cost cutting) projects versus cash flows for expansion projects.
Given that the first die shows a 3, what is the probability that S is an even number?
In the 2000 census of the United States, it was determined that the average household size was 2.59 persons per household (http://www.census.gov).
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