In a Significant Regression Model Determining If There Is a Relationship

question 15

Multiple Choice

In a significant regression model determining if there is a relationship between college GPA and sales performance (number of units sold in the previous month) , the 95% confidence interval for the number of units sold when GPA = 3.00 was determined to be 20.914 to 22.657.The correct interpretation is ________________________ .

• A)we can be 95% confident that the number of units sold per month by a particular salesperson with a college GPA of 3.00 is between 20.914 and 22.657 units
• B)we can be 95% confident that the average number of units sold per month by salespersons with a college GPA of 3.00 is between 20.914 and 22.657 units
• C)the number of units sold per month by a salesperson with a college GPA of 3.00 will be between 20.914 and 22.657 units 95% of the time
• D)95% of the time the average number of units sold per month will be between 20.914 and 22.657 units
• E)we can be 95% confident that each month between 20.914 and 22.657 units will be sold

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Definitions:

Point Estimate

A single value estimate or guess of a population parameter based on sample data.

Sampling Error

The difference between the population parameter and the sample statistic due to chance variation in selecting a sample.

Nonsampling Error

Errors not related to the act of selecting a sample from the population but can occur during data collection, recording, or analysis stages.

Measurement Error

Nonsampling error that results from the incorrect measurement of the population characteristic of interest.