Multiple Choice Exercise

*** Choose one answer and click [Submit] button

4.1 Which of the following data has a mean of 28 and a median of 30?

12, 20, 30, 40
12, 30, 30, 40
12, 40, 30, 40
12, 40, 20, 40

        

4.2 Six statistical scores are 70, 60, 80, 90, 90, 70. What is the median of these scores?

70
75
80
90

        

4.3 Which of the following properties of the mean is incorrect?

The mean is greatly affected by an extreme value.
The sum of deviations from the mean is not zero.
The sum of squares of deviations about the mean is not greater than the sum of squares of deviations of any other number.
It is the mean that minimizes the sum of squares of deviations.

        

4.4 What is the variance of the following numbers?

     8, 10, 11, 12, 14

11
8
4
2

        

4.5 The X and Y data are as follows:

     X: 1, 2, 3, 4, 5, 6

     Y: 2, 4, 6, 8, 10, 12

What is their correlation coefficient between X and Y?

0
0.5
1
-1