The variance of the sample consisting of the values 2, 4, 6, 8, ...

[a0266361136]

The variance of the sample consisting of the values 2, 4, 6, 8, 10 is
 a. 6 c. 10
  b. 8 d. 12

Question 2

When a third variable inserted into the analysis changes the results when two other variables were studied previously, this third variable is called a moderator variable.
 
 Indicate whether the statement is true or false

[laurnthompson]

Answer to Question 1

C
The variance is the sum of squared deviations divided by the degrees of freedom.
This can be calculated with the deviations from the mean (of 6) and the df = n1:
(26)2 + (46)2 + (66)2 + (106)2 / (51) = (16 + 4 + 0 + 16)/4 = 10

Or one could use the computational formula of

=(4+16+36+64+100)  (30)2/n / (n1) = (220180)/4 = 40/4 = 10

Answer to Question 2

T

[a0266361136]

Thanks for the timely response, appreciate it

[frankwu0507]

Wow, this really help