Which of the following statements are true? (A) In testing the hypothesis for th
ID: 3065175 • Letter: W
Question
Which of the following statements are true?
(A) In testing the hypothesis for the equality of two population proportions, the acceptance region for the null hypothesis will be wider than the confidence interval for two population proportions, assuming the same value of alpha.
(B) A 98% confidence interval estimate for the difference between two population proportions is always symmetrical with zero at the center of the interval.
(C) The test of hypothesis for the equality of two population means based on independent samples with 9 observations from each population will have 16 degrees of freedom.
(D) A quality control manager claims that the proportion of defective units produced by machine I (Population 1) is less than the proportion produced by machine II (Population 2). The correct null hypothesis is Ho: p1 – p2 >= 0.
options:
A and B only
C and D only
B and D only
A and C only
A and B only
C and D only
B and D only
A and C only
Explanation / Answer
Option C and D are Correct
(C) The test of hypothesis for the equality of two population means based on independent samples with 9 observations from each population will have 16 degrees of freedom.
(D) A quality control manager claims that the proportion of defective units produced by machine I (Population 1) is less than the proportion produced by machine II (Population 2). The correct null hypothesis is Ho: p1 – p2 >= 0.
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