The Taylor Tool company manufactures hardened tool steel. The specifications for one of its products products, A768C,

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The Taylor Tool company manufactures hardened tool steel. The specifications for one of its products products, A768C, requires a hardness of 550 + 50. The following data have been collected on steel produced over the past three shifts.
The Taylor Tool company manufactures hardened tool steel. The
The Taylor Tool company manufactures hardened tool steel. The
The Taylor Tool company manufactures hardened tool steel. The

b. Use the charts constructed in a part to estimate the mean hardness and standard deviation of this process.
c. What percentage of the process output fails to comply with specification?
d. construct and R charts for the data and repeat parts a through c.
e. Compare your results using an s chart and an R chart to estimate process variation. Which would you prefer and why?

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