The carbon content (in ppm) was measured for each of

The carbon content (in ppm) was measured for each of six silicon wafers. The results were

2.41 2.45 2.21 2.32 2.25 2.38

Assume that carbon contents are normally distributed.

a. Find a 95% prediction interval for the carbon content of a single wafer.

b. Find a tolerance interval for the carbon content that contains 90% of the wafers with 95% confidence.

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