Question: To study the effect of temperature on yield in a chemical process, five batches were produced at each of three temperature levels. The results follow. Construct an analysis of variance table. Use a .05 level of significance to test whether the temperature level has an effect on the mean yield of the process.

50ºC 60ºC 70ºC

34 30 23

24 31 28

36 34 28

39 23 30

32 27 31