According to a report in The Globe and Mail, the Canadian oil and gas industry "ramped up" investment spending in the period from 2000 to 2001 ("Energy Sector Ramps Up Spending," The Globe and Mail, January 29, 2001, p. B14). The accompanying table shows the spending levels (in millions of dollars) in each of those years for nine top oil and gas companies.
a. Using a 0.01 level of significance, is there sufficient evidence to support the claim that spending is greater in 2001 than in 2000?
b. Construct a 98% confidence interval for the mean of the differences. Do the confidence interval limits contain 0, indicating that there is not a significant difference between the two years' spending levels?

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Company 2000 spending 168 1153 1190 1415 1121203 954 957 1998 2001 spending 1940 1800 1710 1500 1500 1410 1320 1200 935