In a Study to Determine the Least Amount of Time

question 51

Multiple Choice

In a study to determine the least amount of time necessary to clean an SUV while maintaining a high quality standard, the owner of a chain of car washes designed an experiment where 20 employees were divided into four groups, each with five members. Each member of each group was assigned an SUV to clean within a certain time limit. The time limits for the groups were 20 minutes, 25 minutes, 30 minutes, and 35 minutes. After the time limits for each group had expired, the owner inspected each SUV and rated the quality of the cleaning job on a scale of 1 to 10. What are the factor levels for this study?

• A) the time limits: 20 min, 25 min, 30 min, 35 min
• B) the number of employees in each group: 5
• C) the quality ratings: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
• D) the number of groups: 4

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Definitions:

Zero Correlation

A statistical relationship indicating no association between two variables.

Linear Regression Equation

An equation used to predict a dependent variable based on one or more independent variables, fitting a straight line to the observed data.

Horizontal Line

A horizontal line is a straight line that goes from left to right or right to left, maintaining the same elevation at all points.

Scatterplot

Graphical display of paired scores on two variables measured at the interval or ratio level of measurement.