3

The grades of five students in mathematics and chemistry are:

Mathematics 6 4 8 5 3. 5
Chemistry 6. 5 4. 5 7 5 4

Determine the regression lines and calculate the expected grade in chemistry for a student who has a 7.5 in mathematics.

xi yi xi ·yi xi2 yi2
6 6. 5 36 42.25 39
4 4. 5 16 20.25 18
8 7 64 49 56
5 5 25 25 25
3.5 4 12.25 16 14
26.5 27 153.25 152.5 152

Correlation and Regression Operations

Correlation and Regression Operations

Correlation and Regression Operations

Correlation and Regression Operations

Correlation and Regression Solution

Correlation and Regression Solution