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Suppose that .06 of each of two populations possess a given characteristic. Samples of size 400...

Suppose that .06 of each of two populations possess a given characteristic. Samples of size 400 are randomly drawn from each population. The standard deviation for the sampling distribution of differences between the first sample proportion and the second sample proportion (used to calculate the z-score) is _______.

Select one:

a. 0.05640

b. 0.00014

c. 0.00300

d. 0.01200

Suppose that there is no difference in the population means of two populations. Suppose also that the variance of the first population is 28 and the variance of the second population is 30. A random sample of size 49 is drawn from the first population and a random sample of size 36 is drawn from the second population. What is the standard deviation for the sampling distribution of the differences in sample means?

Select one:

a. 1.185

b. 3

c. 1.404

d. 9

Math   Statistics-And-Probability   
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