Five measurements were taken in an oven where a product is c

Five measurements were taken in an oven where a product is cured at 350F. It is critical for the process that the curing occurs close to 350F. The measurements results are: X₁ 351, X₂ 352, X₃ 349, X₄ 355, X₅ 348 and the standard deviation from previous studies were found to be 1.2.

a. Determine the interval limits for this oven with 90% confidence

Solution

Five measurements were taken in an oven where a product is cured at 350F. It is critical for the process that the curing occurs close to 350F. The measurements results are: X1 351, X2 352, X3 349, X4 355, X5 348