QM II- Module 4

A pie chart is a segmented circle whose segments add up to ______ degrees.

360

Which of the following are the estimated model coefficients of the simple linear regression equation?

b0 and b1

A(n) ______ depicts the frequency or the relative frequency for each category of a qualitative variable as a series of horizontal or vertical bars, the lengths of which are proportional to the values that are depicted.

bar chart

A bar chart is sometimes referred to as a ___chart.

column

Relative frequency distributions are generally more useful than frequency distributions when

comparing data sets of different sizes.

___ tables help us summarize the relationship between the two___variables

contingency, categorical

In a simple linear regression, an downward sloping trend line suggests a___linear relationship between x and y.

negative

In a simple linear regression, an horizontal line suggests___linear relationship between x and y.

no

How many response variable(s) does a simple linear regression model have?

one

Simple linear regression model uses___explanatory variable.

one

A(n) ______ is a segmented circle whose segments portray the relative frequencies of the categories of some qualitative variable.

pie chart

One method of graphical presentation for qualitative data is a(n) ______.

pie chart

In a simple linear regression, an upward sloping trend line suggests a___linear relationship between x and y.

positive

Consider the simple linear regression model: y = β0 + β1x + ε Which symbol represents the explanatory variable?

x

Consider the simple linear regression model: y = β0 + β1x + ε Which symbol represents the intercept?

β0

Consider the simple linear regression model: y = β0 + β1x + ε Which symbol represents random error?

ε

If the sample regression equation is ŷŷ = 15 - 5x, which of the following is the correct interpretation of the estimated slope coefficient?

For every unit increase in x, ŷŷ decreases, on average, by 5 units.

If the sample regression equation is ŷŷ = 15 + 5x, which of the following is the correct interpretation of 5?

For every unit increase in x, ŷŷ increases, on average, by 5 units.

Which of the following BEST describes a frequency distribution for qualitative data?

It groups data into categories, and records the number of observations in each category.

If the sample regression equation is ŷŷ = 15 + 5x, which of the following is the correct interpretation of the estimated intercept?

The line crosses the y axis at y = 15.

If the sample regression equation is found to be ŷŷ = 5 + 10x, what is the estimate for the intercept β0?

5