Normal distribution has a mean
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?
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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.
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?
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 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.
A sample of n = 9 scores has a standard error of 6. Determine the standard deviation of the population from which the sample was obtained?
A two-tailed hypothesis test is being employed to evaluate a treatment effect with a = .05. If the sample data produce a z-score of z = 2.24, then what is the correct decision?
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