4. A machine shop contains 3 ovens that are used to heat metal specimens. Subject to random fluctuations, they are all supposed to heat to the same temperature. To test this hypothesis, temperatures were noted on 15 separate heatings. The following data resulted.

Do the ovens appear to operate at the same temperature? Test at the 5 percent level of significance. What is the p-value?

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Oven 1 2 3 23 Temperature 492.4, 493.6, 498.5, 488.6, 494 488.5, 485.3, 482, 479.4, 478 502.1, 492, 497.5, 495.3, 486.7