# Question: Reconsider the data in Exercise 8 12 Suppose that four center

Reconsider the data in Exercise 8.12. Suppose that four center points were added to this experiment. The molecular weights at the center point are 90, 87, 86, and 93.

In exercise

a. Analyze the data as you did in Exercise 8.12, but include a test for curvature.

b. If curvature is significant in an experiment such as this one, describe what strategy you would pursue next to improve your model of the process.

In exercise

a. Analyze the data as you did in Exercise 8.12, but include a test for curvature.

b. If curvature is significant in an experiment such as this one, describe what strategy you would pursue next to improve your model of the process.

## Answer to relevant Questions

An engineer has performed an experiment to study the effect of four factors on the surface roughness of a machined part. The factors (and their levels) are A = tool angle (12, 15), B = cutting fluid viscosity (300, 400), C = ...In exercise 8.18 Suppose that only one replicate of the 24 design in exercise 8.4 could be run, and that we could only conduct eight tests each day. Set up a design that would block out the day effect. Show specifically which runs would be ...Suppose that you have 15 observations on the number of hours to failure of a unit. The observations are 259, 53, 536, 1320, 341, 667, 538, 1713, 428, 152, 29, 445, 677, 637, 696, 540, 1392, 192, 1871, and 2469. Is the ...A simple series system in shown in the accompanying figure. The lifetime of each component is exponentially distributed and the for each component is shown in the figure. Assuming that the components operate ...Post your question