SOLUTION: A group of high school students was surveyed about their use of various drugs, including alcohol. Asked how frequently they had been drunk in the previous six months, the students

Click here to see ALL problems on Probability-and-statistics

Question 84214This question is from textbook Elementary Statistics in Social Research
: A group of high school students was surveyed about their use of various drugs, including alcohol. Asked how frequently they had been drunk in the previous six months, the students responded:
4 2 0 2 1 3 0 1 7 5 3
Calculae the (a) range (b) mean deviation, and (c) variance and standard deviation for these self-report scores. This question is from textbook Elementary Statistics in Social Research

Answer by venugopalramana(3286) (Show Source):
You can put this solution on YOUR website!

SEE THE FOLLOWING EXAMPLE AND TRY.
COME BACK IF IN DIFFICULTY
TABULATE AND DO AS FOLLOWS.HOPE IT IS CLEAR.PLEASE COME BACK IF IN DOUBT
x X=x-M X^2
1 4 -2.4 5.76
2 5 -1.4 1.96
3 8 1.6 2.56
4 7 0.6 0.36
5 9 2.6 6.76
6 8 1.6 2.56
7 7 0.6 0.36
8 3 -3.4 11.56
9 6 -0.4 0.16
10 7 0.6 0.36

SUM=S= 64 S.S.D. = 32.4 S.S.D=SUM OF SQUARES OF DEVIATIONS
N0.=N = 10 N0. = N = 10
MEAN=M= 6.4 VARIANCE=V= 3.24 =MEAN OF SUM OF SQUARES OF DEVIATIONS
S.D = SQRT.(V) 1.8 =ROOT OF MEAN OF SUM OF SQUARES OF DEVIATIONS