For the following values, calculate the mean, variance, and ...

[big1devin]

For the following values, calculate the mean, variance, and standard deviation.
  Data: 6, 8, 9, 12, 15

Question 2

Counting the number of responses to questions in a survey by hand is called _____.
 a. index analysis
  b. tallying
  c. elaboration analysis
  d. moderator analysis

[Dnite]

Answer to Question 1

mean = 10
variance = 12.5
standard deviation = 3.54

calculation of mean:
50/5

calculation of variance:
s2 = SS/df
(610)2 + (810)2 + (910)2 + (1210)2 + (1510)2 / 4 = 12.5
or using the computational formula:
(36+64+81+144+225)  (50)2/5 / 4 = (550  500) / 4 = 12.5

calculation of standard deviation:
square root of 12.5

Answer to Question 2

B