An Appliance Manufacturer Is Interested in Determining Whether the Brand

question 31

Multiple Choice

An appliance manufacturer is interested in determining whether the brand of laundry detergent used affects the average amount of dirt removed from standard household laundry loads. An experiment is set up in which 10 laundry loads are randomly assigned to each of four laundry detergents-Brands A, B, C, and D (a total of 40 loads in the experiment) . The amount of dirt removed, y, (measured in milligrams) for each load is recorded and subjected to an ANOVA analysis, including a follow-up Tukey analysis. Which of the following inferences concerning the Tukey results below is incorrect? $\begin{array}{cc}\text { Brands } & \text { Sample Means } \\\hline \mathrm{D} & 186 \\\mathrm{C} & 177 \\\mathrm{~B} & 142 \\\mathrm{~A} & 131\end{array}$

• A) \(\mu _ { \mathrm { C } } < \mu _ { \mathrm { D } }\)
• B) \(\mu _ { \mathrm { B } } < \mu _ { \mathrm { D } }\)
• C) \(\mu _ { \mathrm { A } } < \mu _ { \mathrm { C } }\)
• D) \(\mu _ { \mathrm { D } } > \mu _ { \mathrm { A } }\)

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Definitions:

Labour Needs

The amount and type of workforce required by an organization to achieve its objectives effeciently.

Simplest Approach

The method or solution that involves the least complexity or fewest steps to address a problem or task.

Learning Curve Coefficients

Quantitative measures that describe the rate at which learning and efficiency improvements occur over time in performing a task.

Learning Curve

The graphical representation of how an increase in learning comes from greater experience or the decrease in marginal costs over time.