Quizzes of regression and correlation

These quizzes help us review and practice what we obtained in this chapter. They are presented in "show-hide" form similar to the sections of a web page as we are already familiar. Quizzes are multiple choice questions. After choosing an option, an announcement of result appears. To return back to this page, we click "OK" on the announcement. Of course we can choose again.

Quiz 1

0,20 is the correlation coefficient between `x` and `y`. So, when `x` increases

Quiz 2

- 0,80 is the correlation coefficient between the time for internet and the time for reading book of students. This phenomenon is explained by

Quiz 3

Correlation coefficient between `x` and `y` is - 0,50. So the correlation coefficient between `y` and `x` is

Quiz 4

0,80 is the value of `R^2` of the linear regression equation between `x` and `y`. Then

Quiz 5

In least squares method, residue is

Quiz 6

If `R^2=0`, what is wrong ?

Quiz 7

Relationship between `x` and `y` is strongest when the value of correlation coefficient is

Quiz 8

Least squares method is used to calculate

Quiz 9

Principle of least squares method is

Quiz 10

In linear relationship between `X` and `Y`, when we change the unit of `X`:

This web page was last updated on 03 December 2018.