# Question: An experiment was run to study the effect of two

An experiment was run to study the effect of two factors, time and temperature, on the inorganic impurity levels in paper pulp. The results of this experiment are shown in Table 8E.5:

a. What type of experimental design has been used in this study?

b. Fit a quadratic model to the response, using the method of least squares.

a. What type of experimental design has been used in this study?

b. Fit a quadratic model to the response, using the method of least squares.

## Answer to relevant Questions

a. What type of experimental design has been used? Is it rotatable? b. Fit a quadratic model to these data. What values of and will maximize the Mooney viscosity? Find the residuals from the tool life experiment in Exercise 8.2. Construct a normal probability plot of the residuals. Plot the residuals versus the predicted values. Comment on the plots. An electronic component in a dental x-ray system has an exponential time to failure distribution with. What are the mean and variance of the time to failure? What is the reliability at 30,000 hours? Consider the following 10 observations on time to failure: 50, 191, 63, 174, 71, 62, 119, 89, 123, and 175. Is either the exponential or the Weibull a reasonable choice of the time to failure distribution? Consider the parallel system shown in the accompanying figure. The reliability of each component is provided in the figure. Assuming the components operate independently, calculate the system reliability.Post your question