On Saturdays, Cars Arrive at David Zebda's Scrub and Shine

question 69

Multiple Choice

On Saturdays, cars arrive at David Zebda's Scrub and Shine Car Wash at the rate of 80 cars per hour during the ten-hour shift.David wants a sample of 40 Saturday customers to answer the long version of his quality service questionnaire.He randomly selects 9 as a starting point and instructs the crew to select the 9th customer and every 20^th customer thereafter (9, 29, 49, etc.) .His sample is a __________.

• A)convenience sample
• B)simple random sample
• C)unsystematic sample
• D)stratified sample
• E)systematic sample

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Definitions:

Regression Line

A line of best fit through a dataset in linear regression analysis, showing the relationship between the independent and dependent variables.

Independent Variable

An independent variable is a variable that is manipulated to determine its effects on another variable.

Normal Distribution

A probability distribution demonstrating symmetry around the mean, indicating that data points close to the mean occur more often than those far from it.

Multiple Regression

A mathematical method that depicts how a dependent variable is connected to two or more independent variables.