A consumer testing service, wishing to test the accuracy of the thermostats of three different kinds of electric irons, set them at 480°F and obtained the following actual temperature readings by means of a thermocouple:

Use the computing formulas of Exercise 15.4 to calculate the sums of squares required to test at the 0.05 level of significance whether the differences among the three sample means can be attributed to chance.

Transcribed Image Text:

Iron X 474. 496, 467,471 Iron Y: 492,498 Iron Z: 460, 495, 490