Which of the following is NOT a reason why the procedures to

Which of the following is NOT a reason why the procedures to estimate differences of two proportions or testing a claim about two proportions work? Choose the correct answer below. x1+x2 ni+ n2 OA. The pooled estmate of the common value of pi and p is p MITA OB. Since pi and p2 are each approximated by a normal distribution, the difference p P2 will also be approximated by a OC. The form of the confidence interval utilizes the same variance as when testing claims using hypothesis tests. OD·The variance of the differences between two independent random variables is the sum of their individual variances. normal distribution with mean p1-P2.

Solution

The form of the confidence interval has different variance from when testing claims using hypothesis tests.

So, option (C) is correct.

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The degree of freedom of paired sample t-test is n-1.

So, option A is correct.