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A civil engineer is analyzing the compressive strength of concrete. Compressive strength is approximately normally distributed with variance = 1000 psi2. It is desired to estimate the compressive strength with an error that is less than 14 psi at 95% confidence. What sample size is required? Round your answer up to the nearest whole number. The answer must be exact.
The standard deviation is 2 pounds. If 15% of the suitcases are overweight, Determine the maximum weight allowed by the airline. Assume the variable is normally distributed.
Assume half of the 200 passengers are men. What doorway height satisfies the condition that there is a 0.95 probability that this height is greater than the mean height of the 100 men?
In a BMT class test the scores of 8 students are: 11; 10; 6; 3; 11; 10; 9; 11. Assume the sores are a simple random sample from a normally distributed population. What is the point estimate of the standard deviation?
In the biology class the mean score was 79 with standard deviation 5.
Suppose that a certain college class contains 45 students. Of these, 26 are sophomores, 25 are chemistry majors, and 7 are neither. A student is selected at random from the class.
Looking for a good original (yet cited) response to this definition. And if you can describe two common ones with an example for each that would be great.
Solve for the following items: The point on the x-axis that is equidistant (equal distance)from (10,4) and (6,2).
He is twice as likely to visit city X than the other city. Obtain the transition probability matrix. Also determine the proportionate visits by him to each of the cities in the long run.
What is the probability that in your random sample of 50 students, between one thirds and two thirds favor the new policy?
A table showing the season in which the first 36 U.S. presidents died. Research question: At alpha=0.10, Can you reject the hypothesis that presidents' deaths are uniformly distributed by season?
The mean number of passengers per cruise is 1,820 and the standard deviation is 120.
What are the minimum and the maximum starting salaries of the middle 95% of the LU graduates?
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