Questions from Business Statistics

Q: a. What is an assignable cause of variation? b

a. What is an assignable cause of variation? b. What is a random cause of variation?

Q: a. What do we mean when we say that a process

a. What do we mean when we say that a process is in a state of statistical control? b. What should you do when a process is not in control? c. What should you do when a process appears to be in contro...

Q: a. What information is displayed in a Pareto diagram?

a. What information is displayed in a Pareto diagram? b. What makes the Pareto diagram useful as a management tool?

Q: a. What is a control chart? b. Explain

a. What is a control chart? b. Explain how control charts help you perform the five basic activities of statistics. c. What hypotheses are being tested when you use control charts? d. What is the fals...

Q: a. Describe a typical control chart for a process that is

a. Describe a typical control chart for a process that is in control. b. Describe three different ways in which a control chart could tell you that the process is not in control.

Q: a. What is a nonparametric statistical method? b.

a. What is a nonparametric statistical method? b. For the nonparametric approach based on counts, what is being counted? What probability distribution is used to make the decision? c. For the nonparam...

Q: a. What does the chi-squared statistic measure, in

a. What does the chi-squared statistic measure, in terms of the relationship between the observed data and the null hypothesis? b. Do you reject the null hypothesis for large or for small values of th...

Q: Your human resources department has referred 26 employees for alcohol counseling.

Your human resources department has referred 26 employees for alcohol counseling. While the work habits of 15 improved, 4 actually got worse, and the remaining 7 were unchanged. Use the sign test for...

Q: a. List the advantages of nonparametric testing over parametric methods,

a. List the advantages of nonparametric testing over parametric methods, if any. b. List the disadvantages, if any, of nonparametric testing compared with parametric methods. How serious are these sho...

Q: a. How should you interpret this statement: One test is

a. How should you interpret this statement: One test is more efficient than another? b. If the distribution is normal, which would be more efficient, a parametric test or a nonparametric test? c. If t...