The results of Accounting Principals latest Workonomix survey indicate the average American worker spends $1092 on coffee annually (The Consumerist, January 20, 2012). To determine if there are any differences in coffee expenditures by age group, samples of 10 consumers were selected for three age groups (18€“34, 35€“44, and 45 and Older). The dollar amount each consumer in the sample spent last year on coffee is provided below.

a. Compute the mean, variance, and standard deviation for the each of these three samples.
b. What observations can be made based on these data?

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18-34 1355 115 1456 2045 1621 994 1937 1200 1567 1390 35-44 45 and Older 969 434 1792 1500 1277 1056 1922 1350 1586 1415 1135 956 400 1374 1244 825 763 1192 1305 1510