WorksheetsCorrelation & Regression
Total questions: 20
Worksheet time: 20mins
What is a scatter plot?
A graph that shows the relationship of two data sets
A graph that shows information that is connected in some ways
A graph drawn using rectangular bars to show how large each value is
A graph that shows data changing over time
A scatter diagram may reveal
the strength of a relationship.
the direction of a relationship.
the form of a relationship.
all of the above.
State the independent variable (x) and dependent variable (y) for the case below:
The monthly rents of apartments (RM) and the size of the apartments (square feet)
x = monthly rents of apartments , y = size of the apartments
x = size of the apartments , y = monthly rents of apartments
State the independent variable (x) and dependent variable (y) for the case below:
Daily calorie consumption and body weight (kg)
x = Daily calorie consumption, y = body weight
x = body weight, y = Daily calorie consumption
What would be the correlation between Mathematics grade and the time it takes to run a mile?
Positive correlation
No correlation
Negative correlation
Cannot be determined
When the values of two variables move in the same direction, correlation is said to be
Linear
Non-linear
Positive
Negative
The value of the coefficient of correlation r lies between:
0 and 1
-1 and 0
-1 and +1
-0.5 and +0.5
. ________measures the strength of the linear relationship between the dependent and the independent variable.
Correlation Coeeficient
Distance value
Y Intercept
Residual
State the correlation between number of days absent from school and mathematics marks
Positive Correlation
Negative Correlation
No Correlation
Describe the correlation in the graph shown.
A) Strong Negative
B) Strong Positive
C) Weak Negative
D) No Correlation
The value of the ‘coefficient of determination’ (r2) ranges from -1 to +1
True
False
If the correlation coefficient is 0.8, the percentage of variation in the response variable explained by the variation in the explanatory variable is
0.80%
80%
0.64%
64%
Coefficient of correlation of -0.90 and +0.90 have equal strength
True
False
The equation that describes how the response variable (y) is related to the explanatory variable (x) is:
the correlation model
the regression model
used to compute the correlation coefficient
None of these
If the least-squares equation is y = 2x+5, then an increase of 1 unit
in x is associated with an increase of 2 units in y.
True
False
In a regression model, the slope represents the change in the independent variable due to a one-unit change in the dependent variable.
True
False
In regression analysis, the variable that is being predicted is the
response, or dependent, variable
independent variable
intervening variable
is usually x
In a simple linear regression analysis, the correlation coefficient (r) and the slope (m) __________ have the same sign.
always
never
sometimes
The ___________of the simple linear regression model is the value of y when the mean value of x is zero.
correlation coefficient
slope
y intercept
coefficient of determination
