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A normal population has a mean of μ = 100. A sample of N = 36 is selected from the population, and a treatment is administered to the sample. After treatment, the sample mean is computed to be = 106.
a. Assuming that the population standard deviation is σ = 12, use the data to test whether or not the treatment has a significant effect. Use a z test with α = .05
b. Repeat the z-Test, but this time assume that the population standard deviation is σ = 30.
c. Compare the results from part a and part b. How does the population standard deviation influence the outcome of a z-test?
At the 0.10 significance level was the sample result different from the usual pattern? Show how to plug this in megastat and if it is chi square or anova.
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Find the regression line associated with the set of points. (Round all coefficients to four decimal places.) (2, 4), (4, 8), (8, 12), (10, 0)
A) If Y is normal with μ = 200 and σ = 12, what is the probability that Y will be between 186 and 210? B) If X is normal with μ = 8.48 and σ = 1.60, what is the difference between the two values of X which include the central 70% of the probability..
Use these data to test whether there are any significant differences among the three age groups. Use α = .05. SSbetween= ? T2/n - G2/N = 152/3 + 122/3 + 32/3 - 302/9
University of Michigan researchers reported in the Journal of the National Cancer Institute that quitting smoking is especially beneficial for those under age
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Compute the Facebook's expected daily return and the standard deviation using its realized return from May 18, 2014 to Dec 31,2017.
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