A random sample of 10 observations is selected from the first normal population and 8 from the second normal population. For a one-tailed test of hypothesis at the .01 significance level to determine if there is a difference in the population means, the degrees of freedom and the critical value(s) are Select one: O a 16, 2.583 O b. 18, 2.878 O c. None of the above O d. 16, 2.921

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