According to the 2016 Consumer Expenditure Survey, Americans spend an average of $1,124 on cellular phone service annually. Suppose that we wish to determine if there are differences in cellular phone expenditures by age group. Therefore, samples of 10 consumers were selected for three age groups (18-34, 35-44, 45 and older). The annual expenditure (in dollars) for each person in the sample is provided in the table below. 18-34 35-44 45 and older 1,455 969 1,135 215 534 956 1,556 1,892 400 2,045 1,600 1,374 1,621 1,277 1,244 1,094 1,156 825 1,937 1,922 763 1,200 1,350 1,192 1,567 1,686 1,305 1,390 1,515 1,510 (a) Compute the mean, variance, and standard deviation for each of the three samples. (Round your answers to two decimal places.) 18-34 35-44 45+ mean s $ $ variance standard deviation s $ $ (b) What observations can be made based on these data? The 18-34 group spends ---Select--- on cellular phone service compared to the 35-44 group. The 45+ group appears to spend ---Select--- von cellular phone service than the other two groups. hat observations can be made based on these data? on cellular phone serv ne 18-34 group spends ---Select--- -Select- at least $50 more at least $50 less Help? Read It a similar amount on cellular phone service than ti ppears to spend ---Select--- -Select-- less more