Chapter 17 Quiz Review

What type of data do we mainly use with regression?

• Non-experimental

• Experimental

Assuming that all other factors are held constant, what happens to the standard error of estimate as the correlation between X and Y moves toward zero?

• The standard error of estimate gets larger

• The standard error of estimate gets smaller

• The standard error of estimate remains unaffected

• The standard error of estimate is halved

The statistical technique for finding the best-fitting straight line for a set of data is called _____.

• Regression

• Correlation

• Slope

• One-Way ANOVA

If the slope constant (b) in a linear equation is positive, then a graph of the equation will be a line tilted from lower left to upper right.

• True

• False

Answer explanation

True. A positive slope indicates that Y increases (goes up in the graph) as X increases (goes to the right in the graph).

• -3

• 7

• 1

• N/A

• -1

• -5

• 3

• 1

• a

• b

• X

• Y

What equation do we use to measure the distance between a raw data point and the regression line?

• Y - Ȳ

• (Y - Ȳ)²

• Σ(Y - Ȳ)²

• Σ(Y - Ȳ)

What is measured by the formula Σ(Y - Ȳ)² ?

• Total Squared Error

• Distance

• Linear Regression

• Residual

Which of the following denotes our predicted value when dealing with regression?

• Ȳ

• Y

• R²

• a

Answer explanation

Ȳ represents our predicted Y-values when dealing with regression.