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For the samples summarized below, test the hypothesis that the two variances are equal, at α = 0.05
Sample 1 Sample 2Sample variance 25 10Sample size 8 18
a. Accept the hypothesis because the test value 6.25 is greater than the critical value 3.16.
b. Reject the hypothesis because the test value 2.50 is less than the critical value 3.01.
c. Reject the hypothesis because the test value 6.25 is greater than the critical value 3.01.
d. Accept the hypothesis because the test value 2.50 is less than the critical value 3.16.
Among the half that had surgery, 80% showed improvement after three months, but only 54% of those who used the wrist splints improved. what's the standard error of the difference in the two proportions?
Which measure of association would the researcher use to compare the relationship between the IV and DV? Why?
Can we conclude that mean time for game is less than 3.50 hours? Use.05 significance level.
Draw the graph of the regression line on the same plot as the scatter diagram above.
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The rate of defects among CD players of a certain brand is 1.1%. Use the Poisson approximation to the binomial distribution to find the probability that among 240 such CD players received by a store, there is at most one defective CD player.
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