Question

practice

1 Grade	practice 2 Grade
95	85
85	95
80	70
70	65
60	70

The table above shows the first two practice grades for five students. Use this data to answer the next four questions.

a) Calculate the correlation coefficient. Round to two decimal places

b)Find the linear regression equation, treating practice 1 as x and practice 2 as y. What is the slope of this equation? Round to two decimal places.

c) Use the linear regression equation to predict the score on practice 2 for a student who received a 90 on practice 1. Round to the nearest whole number

d) Using this linear regression model to predict the practice 2 score for a student who earned a 30% on the first practice would be an example of...

Correlation

Slope

Causation

Extrapolation

Answer 1

(a) r = 0.69

(b) y = 26.78+0.64x

slope = 0.64

(c) 84

(d) Extrapolation