What is the z-score
A sample of n = 16 scores is chosen from population with m = 100 and s = 32. If the sample mean is M = 104, what is the z-score for this sample mean?
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Find out the critical value of X2 with 1 degree of freedom for a = .05. (view a table of critical values of X2)
A pressure vessel has 5 pressure relief valves. The probability that valve will operate on demand is .75. Determine is the probability that at least one valve will operate on demand?
The dean of business school desires to form executive committee of 3 from among the 50 tenured faculty members. The selection is to be random and at the school there're 4 tenured accounting faculty. Determine the probability that the committee wil
When the z-score value in a normal distribution is negative, the body is on the right-hand side of the distribution.
Based upon past experience, it is supposed that the number of flaws per foot in rolls of grade 2 paper follows a Poisson distribution with a mean of 1 flaw per 2 feet of paper (0.5 flaw per foot).
A normal distribution has a mean of µ = 80 with s = 20. What score separates the lowest 30% of the distribution from the rest of the scores?
A random sample of n = 4 scores is obtained from the normal population with µ = 20 and s = 4. Determine the probability that the sample mean will be greater than M = 22?
A population has m = 60 and m = 30. For a sample of n = 25 scores from this population, a sample mean of M = 55 would be considered an extreme value.
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