Based on a random sample of 50, a 95% confidence interval for the population proportion was computed. Holding everything else constant, which of the following will reduce the length of the confidence...

Extracted text: Based on a random sample of 50, a 95% confidence interval for the population proportion was computed. Holding everything else constant, which of the following will reduce the length of the confidence interval by half? (CHECK ALL THAT APPLY): OA. Change the confidence level to 68%. OB. Quadruple the sample size. OC. Change the confidence level to 99.7%. OD. Double the sample size. OE. Decrease the sample proportion by half.