Your company employs approximately 450 manufacturing employees in the production of widgets. You need to compare the effects of three new training methods on employee productivity as measured by the number of non-defective units manufactured in 160 hours of work (four workweeks). You have no prior research to indicate which of the new training methods is effective, if any. You suspect that two other factors may play a role in productivity: whether the employee has a manufacturing certification issued by a local community college (yes or no) and the number of years of experience the employee has with the company.

Identify the specific type of statistical test you would use and explain why you would use this statistical test. State your null and alternate hypotheses. Identify the dependent variable and independent variable or variables. For each variable, identify the scale of measurement. What assumptions apply for this statistical test? What sampling technique would you use for this study?