Correlations
Explanatory and response variables
Interpreting x and y intercepts
Residuals and other measures
100
Describe the correlation in terms of direction and strength
What is perfect negative correlation?
100
Determine the explanatory variable from the statement
The age of a motor car and the asking price for the carWhat is the age of a motor car?
100
The average rate of change in the response variable for each increase of one unit of the explanatory variable
What is gradient?
100
___________=predicted value - actual value
What is a residual?
200
Describe the correlation in terms of direction and strength
What is zero correlation?
200
Determine the explanatory variable for the following statement
Performance in a team game and lack of sleep
What is lack of sleep?
200
The value of the response variable when the explanatory is zero
What is the y intercept?
200
If a pattern is present in a residual graph we say this
What is a linear model is not suitable?
300
Describe the correlation in terms of direction and strength
r= -0.7What is a moderate negative correlation?
300
Which determines whether we use row or column percentages, the explanatory or response variable?
What is explanatory variable?
300
Interpret the gradient of the following
predicted shoe size= 0.25 x height -33.4
(height is in cm)
What is for every increase in 1cm of height, there is an increase of 0.25cm in shoe size.
300
The values on the x-axis on a residual graph
What is explanatory values?
400
Describe the correlation in terms of direction and strength
r=0.10
What is a weak positive correlation?
400
A graph used to display percentage proportions
What is stacked column graph?
400
Interpret the y intercept for the following
response time = -8.54 x drug dose +45.55
(time is in seconds)
When there is no drug dose administered, response time is 45.55 seconds
400
The percentage variation in the response variable that can be attributed to the explanatory variable
What is coefficient of determination?
500
To find the correlation coefficient from the coefficient of determination we do this
What is find the square root of the coefficient of determination?
500
If there is variation in the percentage proportions of greater than 5% there is ______________ present
What is association?
500
Interpret the slope and y intercept for the following
Son's height (cm)= 0.54x Father's height (cm) +89.58
What is for every 1cm increase in father's height, there is a 0.54 increase in son's height. When father's height is zero, son's height is 89.58cm
500
interpret a coefficient of determination of 0.89
What is 89% of the change in the response variable can be attributed to the change in the explanatory variable?