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To test whether the true average percentage is 5.5 for a particular production facility, 16 independently obtained samples are analyzed. Suppose that the percentage of SiO2 in a sample is normally distributed with std dev = 0.30 and that xbar = 5.25. H0 = mu = 5.5, Ha: mu not = 5.5. The rejection region(s) for an alpha
= 0.01 test is z <=-2.58 and z>=2.58. The test statistic value z = -3.33.
(a) if the true average percentage is mu = 5.6 and a level alpha = 0.01 test based on n = 16 is used, what is the probability of detecting this departure from H0?
(b) what value of n is required to satisfy alpha = 0.01 and Beta(5.6) = 0.01?
The average SAT verbal score for students from one high school over the last ten exams
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What is the probability that a randomly selected monthly cell phone bill is more than $100?
Heart disease patients often experience spasms of the coronary arteries. Because biological amines such as serotonin may play a role in these spasms, a research team measured serotonin levels post-mortem from patients who died of heart disease and..
If 16 measurements are taken and the standard deviation is 2.1 mg/dl is there enough evidence to support the claim that her standard deviation is greatear than the target at a = 0.01?
nielsen media research provides two measures of the television viewing audience a television program rating which is
You want to determine if your widgets from machine 1 are the same as machine 2. Machine 1 has a sample mean of 50 and a population standard deviation of 5 and a sample size of 25.
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(a) Find the median cost of houses at Coal City in 1988. (b) Find the modal selling price of houses at Coal City in 1988.
the probability that exactly 7 out of 10 students carry an electronic pad with them to university is 0.0212. what is
What is the probability that the 100 randomly selected mangoes have a mean weight less than 14 ounces?
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