Determine control chart

Determine control chart - range

Reference no: EM1390228

A new industrial oven has just been installed at the Piatt Bakery. To develop experience regarding the oven temperature, an inspector reads the temperature at four different places inside the oven each half hour. The first reading, taken at 8:00 a.m., was 340 degrees Fahrenheit. (Only the last two digits are given in the following table to make computations easier.)
Reading

Time 1 2 3 4

8:00 a.m. 40 50 55 39

8:30 a.m. 44 42 38 38

9:00 a.m. 41 45 47 43

9:30 a.m. 39 39 41 41

10:00 a.m. 37 42 46 41

10:30 a.m. 39 40 39 40

a. On the basis of this initial experience, determine the control limits for the range. Plot the experience on a chart.

b. Does there seem to be a time when there is too much variation in the temperature?

Reference no: EM1390228

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