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Suppose that the life in hours of a electronic tube manufactured by a certain process is normally distributed with parameters m = 160 hours and σ. What is the maximum allowable value for σ, if the life X of a tube is to have probability 0.80 of being between 120 and 200 hours?
Based on the sample data, which store has the highest average prices? Use Fisher's LSD test if appropriate.
As his appointment time approaches, you prepare a short explanation of the way that capital gains taxes may be hurting his net returns and the difference between short-term gains and long-term gains.
Did JAL's forward contracts constitute an economic hedge? That is, is it likely that JAL's losses on its forward contracts were offset by currency gains on its operations?
Suppose that the monthly pay is normally distributed with a standard deviation of $400. What is the probability that the monthly pay of a bank teller.
Identify the y-intercept and partial regression coefficients.- If 3 people live in a 6-room home, what is the estimated bill?
In a random sample of 53 concrete specimens, the average porosity (in percent) was 21.6 and the standard deviation was 3.2. a) Find a 90% confidence interval for the mean porosity of specimens of this type of concrete.
What is the probability of a child having a temperature in Group B or Group C - What is the predictive value positive?
Transmission is normally distributed with an average of 78,000 miles and a standard deviation of 15,000 miles. What percentage of these transmissions will last at least 90,000 miles?
Provides a measure of skewness in the distribution of X. Determine the value of b3 for this distribution and using a suitable distributional approximation, find the probability that the mean of a random sample of n = 25 observations will exceed 2.5.
Groundwater contamination in wells. In New Hampshire, about half the counties mandate the use of reformulated gasoline. This has lead to an increase.
At a certain university, the average cost of books per student was 400.00 last semester. In a sample of 40 students this semsester, their average cost was 340.00 with a standard deviation of 80.00.
State the hypotheses for a right-tailed test.
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