12.27 A study has been carried out to compare the United Way contributions made by clerical workers from three local corporations. A sample of clerical workers has been randomly selected from each firm, and the dollar amounts of their contributions are as follows. (Use data file XR12027.)

a. What are the null and alternative hypotheses for this test?

b. Use ANOVA and the 0.05 level of significance in testing the null hypothesis identified in part (a).

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Firm 1 Firm 2 Firm 3 199 108 162 236 104 86 167 153 160 263 218 135 254 210 207 96 201