The company is trying out three types of advertisement; the following are the revenues (in millions) the company generated after using the three types of ads for several months (X ad is tested for 6 months, Y ad is test for 6month, and Z ad is tested for three months) . Decide whether the three ads make a significant difference on the revenues by using F-test.
X Y Z_________
1 4 3_________
3 6 7_________
7 8 5________
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