A retailer believes that its new advertising strategy will increase sales. Previously, the mean spending in 15 categories in both the 18-34 and 35+ age groups was $70.00. 1. Formulate a hypothesis test to determine if the mean spending in these categories has statistically increased. 2. After the new advertising campaign was launched, a marketing study found that the mean spending for 300 respon age group was $75.86, with a standard deviation of $50.90. Is there sufficient evidence to conclude that the advertisin significantly increased sales in this age group? 3. For 700 respondents in the 35+ age group, the mean and standard deviation were $68.53 and $45.29, respectively. I evidence to conclude that the advertising strategy significantly increased sales in this age group? (Evans 228) Advertising Strategy a. b. X_bar S.D. Mean n t-stat c. X_bar S.D. Mean n t-stat e mean spending in 15 categories of consumer items s has statistically increased. he mean spending for 300 respondents in the 18-34 ce to conclude that the advertising strategy $68.53 and $45.29, respectively. Is there sufficient s age group