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An experiment was performed to improve the yield of a chemical process. Four factors were selected, and one replicate of a completely randomized experiment was run. The results are shown in Table E3.4. (a) Estimate the factor eeff ects. Construct a normal probability plot of these e ects. Which e effects appear large? To assess signif cance use the calibrated Lenth procedure with SMOE to pool errors. (b) Prepare an analysis of variance table using the information obtained in part (a). (c) Plot the residuals versus the predicted yield and on normal probability paper. Does the residual analysis appear satisfactory? (d) Construct a contour plot of yield as a function of the important process variables.
What proportion of homes subscribe to Internet service from Ashland and would you say this portion is small, medium, or large - what proportion of homes that are using Ashland's Internet service have Basic cable service?
Formulate a spreadsheet model for performing a computer simulation of the daily sales. Perform 250 replications and obtain the average of the sales over the replications.
Use the normal approximation to estimate the probability of at least one disaster in 25 missions.
Compute z values for each and comment on your findings.
Which of the following would be most helpful in assessing the practical significance of a test of hypotheses about a proportion?
In a study of check out scanners, 5 of 675 items were found to be overcharges, test at the 0.05 significance level, the claim that with scanners, 5% of sales are overcharges.
At the .01 significance level, is there a difference in the mean number of times men and Women order take-out dinners in a month? What is the p -value?
We suggest that you use the graphical approach to CVP analysis to solve the following problem, but you may use any other method to find the answer.
A random sample of 16 ages is drawn from the population, and we find the sample mean of these observations to be μ = 8.76. What is the value of the test statistic?
X is a normally distributed random variable with mean 10 and variance 24. a. Find P(X bigger 14) b. find P(8 smaller X smaller 20)
But each such incident costs $50. What is the probability that maintenance expenses for the press will be no more than $100 on a typical 8 hour workday?
Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size 3. From each telephone number identified as a source, take the fourth, fifth, and sixth digits.
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