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