An automobile manufacturing company is attempting to cope with rising health care costs of its employees. It offers three types of plans. Based on a random sample of 200 employees selected last year, Table 5-7 shows the number that selected each plan. The same table also shows, for a random sample of 150 employees selected in the current year, the number that selected each plan. Can we conclude that employee preferences for the health care plans have changed from last year? Use a = 0.05. What is the p-value?
Table 5-7

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Year Plan 1 Plan 2 40 45 Plan 3 Last year Current year 50 15 110 90