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): a. double the sample size. b. change the confidence level to 99.7%. c. decrease the sample proportion by half. d. quadruple the sample size. e. change the confidence level to 68%.

Plz answer asap! i will reward brainliest and 12 points for these three questions!take notice: these three questions are completely different! 1) what is the percentage of sugar in the syrup made of 10 kg of water and 4 kg of suugar? 2) what was the original price if after 10% discount it became $450? 3) at first a price was decreased by 12%, then it was disounted again by an additional 5%. what is the percent of the total discount? , and remeber i will award brainliest and 12 points!