If two population variances are known, the test for differences in the two population means does not require the populations to be normally distributed if the sample sizes are large.
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Q. 2If Z is a standard normal random variable, the area between Z = 0.0 and Z = 1.25 compared to the area between Z = 1.25 and Z = 2.5 will be:
A) smaller.
B) larger.
C) the same.
D) There is not enough information to answer this question.
Q. 3The cumulative distribution function for a random variable X may be expressed as follows: F(x0 ) = P(X < x0 ).
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Q. 4Suppose that a t test of H0 : 1 - 2 = 0 against H1 : 1 - 2 0 is based on 15 degrees of freedom. If the calculated value of the test statistic is t = -1.75, then the p-value for this test is approximately 0.10.
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Q. 5Measures of central tendency are usually computed from population data rather than from sample data.
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