Interval for the standard deviation of the weights
At the coal mine there is machine that fills railroad cars. When 61 cars were filled, the mean amount per car was 6 tons (12,000 lbs) with standard deviation of 250 lbs. Calculate a 90% interval for the standard deviation of the weights of the cars.
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Calculate the market share for each of the companies. Has there been the change in the market share for any of the companies? (Don't round intermediate calculations. Round your answers to 1 decimal place.)
A) Test this statement with hypothesis test for ?=0.01 and also compute the p value. B) If the true mean age is 30 what is the probability of Type II (?) error for the test done in part A?
A study presents pH measurements of soil specimens taken from 3 different types of soils. The results are given in the following table Soil type pH Measurements Alluvium 6.53, 6.03, 6.75, 6.82, 6.24
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At the coal mine there is machine that fills railroad cars. When 61 cars were filled, the mean amount per car was 6 tons (12,000 lbs) with standard deviation of 250 lbs. Calculate a 90% interval for the standard deviation of the weights of the car
Preliminary plans are underway for construction of a new stadium for the major league baseball team. City officials question the number and profitability of luxury corporate boxes planned for the upper deck of the stadium.
If population of India and China is at 2.3 billion in 2008, how many years will it take to reach 8.9 billion-assuming rate of growth is constant at 2.4%.
Carry out an appropirate hypothesis test, and express the conslusion in a way that would make sense to a 5th grader. Use a significance level of 0.05.
Assume that X is random variable with P(X = 1) = p and P(X =5) = (1 - p). Assume that the conditional distribution of Y given that X = x is Normal with a mean of 3x and Variance of 1.
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