3. (CH9_RE_2) In the article "The Denomination Effect" by Priya Raghubir and Joydeep Srivastava, Journal of Consumer Research, Vol. 36, researchers reported results from studies conducted to determine whether people have different spending characteristics when they have larger bills, such as a $20 bill, instead of smaller bills, such as twenty $1 bills. In one trial, 89 undergraduate business students from two different colleges were randomly assigned to two different groups. In the "dollar bill" group, 46 subjects were given dollar bills; the "quarter' group consisted of 43 subjects given quarters. All subjects from both groups were given a choice of keeping the money or buying gum or mints. The article includes the claim that "money in a large denomination is less likely to be spent relative to an equivalent amount in smaller denominations." Construct a 90% confidence interval. Group 1 Group 2 Subjects Given $1 Bill Subjects Given 4 Quarters Spent the money Subjects in group a. Identify the best point estimate for p1 - pz. b. Find the critical values by first sketching the normal distribution curve and identifying the indicated area on the grap c. Find the margin of error