Show transcribed image text 4) In a sample of 100 store customers, 43 used a MasterCard. In another sample 8 120 customers. 59 used a Visa card. Find the 95% confidence interval for the difference in proportions of customers who use either card. student's financial aid award for both years shown below: Fr $25K 31 22 15 17 23 20 18 26 33 27 28 30 2626 Find a 95% confidence interval for the true mean difference in years. Assume that 5) A sample of 15 students are tracked for the first two years of college, with each hoth vears' financial aid awards are approximately normally distributed.
4) In a sample of 100 store customers, 43 used a MasterCard. In another sample 8 120 customers. 59 used a Visa card. Find the 95% confidence interval for the difference in proportions of customers who use either card. student's financial aid award for both years shown below: Fr $25K 31 22 15 17 23 20 18 26 33 27 28 30 2626 Find a 95% confidence interval for the true mean difference in years. Assume that 5) A sample of 15 students are tracked for the first two years of college, with each hoth vears' financial aid awards are approximately normally distributed.
