A marketing study found that the mean spending in 15 categories of consumer items for 297 respondents in the 18– 34 age group was $ 91.86 with a standard deviation of $ 50.90. For 536 respondents in the 35+ age group, the mean and standard deviation were $ 81.53 and $ 45.29, respectively. Develop 95% confidence in tervals for the mean spending amounts for each age group. What conclusions can you draw?