Task 6 What time is it?

Question 1

Slope (b)

Answer 1

b is the slope, so when b is 3, it means that someone who scored 1 point higher on X is supposed to score 3 points higher on Y
b=r_XY⋅s_Y/s_X

Question 2

Intercept (a)

Answer 2

where the line passes the Y axis.

→determine the hight of the regression line

Question 3

residual (prediction error)

Answer 3

→when the score is different as the predition

→describes the difference between the predicted ad actual score

Question 4

Explained variation= Sum of squares regression

Answer 4

→so the outcome shows how much of the total variation we can explain by using X
→explained variation shows the difference between mean and variables

Question 5

• Unexplained variation= Sum of squares Residual

Answer 5

→shows the difference to the regression line

Question 6

Higher-order model (residual plot)

Answer 6

When you take the residuals for the y axis

• Used to see if there are more associations

Question 7

Multiple Independent variables

Answer 7

You could measure additional factors and add these to the regression model
→Y ̂=a+b_1 X_1+b_2 X_2+b_3 X_3

Question 8

Restriction of Range

Answer 8

When you restrict the range e.g. when you only use the scores from 500-600