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Question: Nonparametric tests, power, and variability. Serlin and Harwell (2004) analyzed the power of statistical designs when distributions are not normal. In their article, they reported, "It is well-known that for normally distributed errors parametric tests are optimal statistically, but perhaps less well-known is that when normality does not hold, nonparametric tests frequently possess greater statistical power than parametric tests" (Serlin & Harwell, 2004, p. 492). Explain why power can be greater using a nonparametric test when data are not normally distributed.
A bank wants to get new customers for their credit card. They try two different approaches in their marketing campaign. The first promises a "cash back" reward; the second promises low interest rates. A sample of 500 people are mailed the first br..
choose independently two number B and C at random from the interval [-1,1] with uniform distribution, and consider the quadratic equation x^2+Bx+C=0. Find the probability that the roots.
When the results of a survey or poll are published, the sample size and the margin of error are both given. For example: 1000 voters were surveyed and 39±2% of the voters agree with the president. In this example N=1000 and the margin of error (Mo..
Draw the scatter diagram of Y against X, and explain any noted significance. Compute correlation coefficient (ρ or r), and what do you find? Make sure to explain thoroughly what you mean
Let E be the event that the number which comes up when a single die is tossed is divisible by 3. Let X be the number of times that event E occurs in 3 tosses of the die.
1. a researcher examines the records of all registered voters in one city and finds that 43 are registered democrats.
Tom Smith wants to test the hypothesis that adult men have a mean weight that is greater than 150 pounds. Tom surveys the adult male members of his family and obtains 40 sample values
in 1999 a sample of 200 in-store shoppers showed that 42 paid by debit card. in 2004 a sample of the same size showed
At 99% confidence, test to determine if there is sufficient evidence to indicate that process 2 takes a significantly longer time to manufacture the Zip drives.
the data below are the final exam scores of 10 randomly selected statistics students and the number of hours they
Calculate the paired sample t statistic for these mood scores and How has the relation between the mean and the median changed? What does this suggest about the distribution of the transformed data?
A company produces and sells four grades of industrial solvents - A, B, C, and D.The selling price per gallon of each grade of solventis $6.40, $5.00, $4.20, and $3.50 respectively.
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