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Under what circumstances a 6 - point treatment effect can be very large, and in some circumstances it can be very small. Assume a sample of n = 16 individuals is selected from a population with a mean of µ = 70. A treatment is administered to the sample and, after treatment, the sample mean is found to be M = 76. Notice that the treatment appears to have increased scores by an average of 6 points.
a) If the population standard deviation is σ = 20 is the 6 point effect large enough to be statistically significant? Use the two - tailed test with α = .05
b) If the population standard deviation is σ = 8 is the 6-point effect large enough to be statistically significant? Use the two - tailed effect with α = .05
In your own words, describe the concept of correlation, include the coefficient of correlation (r) and the coefficient of determination (r2) in your description.
An old saying in golf is "you drive for show and you putt for dough." The point is that good putting is more important than long driving for shooting low scores and hence winning money.
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The reason why we finish our calculation by dividing range by 4 is that in most data sets 95% of the data values fall within two standard deviations of the mean.
Now compute the standard deviation for this distribution.
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Create a 95% confidence interval for the population mean days absent for sickness based on this sample. Select the answer closest to your results.
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What critical value should the company officials use to determine the rejection region?
An article reports that when each football helmet in a random sample of 44 suspension-type helmets was subjected to a certain impact test, 25 showed damage.
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