Lines
Graphs
Models
Variable
100
What does regression analysis use to minimize the difference between the fitted line and the actual data?
Methods of least squares
100
What is the equation for best line of fit?
Y=a+b x X
100
What does the P values tell us about the model?
it tells us whether or not the model is significant
...
100
what determines a good value?
it depends on the sample or population under study and
...
200
What is the goal of simple linear regression?
fit the best line of fit to the data
200
what is the Y-intercept in the equation?
a
200
true or false? the percentage of variability is not determined by the fitted model over the total variability in the data
false...
200
true or false, the independent variable is effected by the dependent variable
false
300
Is this a positive or negative relationship?
positive
300
What are the 2 steps in finding the simple linear regression?
- start by examining the relationship through a scatter plot
-verify what you saw in the scatterplot with a correlation coefficient
300
what determines a good model?
-if the result is significant
...
300
Ho:β= 0
what does this tell us about the independent variable?
tells us that it is not useful for prediction
400
give an example of a negative correlation.
When the student has many absences so there is a decrease in their grades. when there's is a decrease in attendance, there is a decrease in grades.
400
true or false,if a correlation coefficient is not significant proceed to regression analysis
false...
400
What are the two types of tests?
Null: the model is not a good prediction model
Alt:the model is a good and significant prediction model
400
how is a parameter a good or bad predictor?
good if the result is significant and bad if its not significant