SOLUTION: A focus group of 10 adults was chosen to evaluate the performance of a candidate during a presidential debate. Each member of the group rated the overall performane on a scale of
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Question 84213This question is from textbook Elementary Statistics in Social Research
: A focus group of 10 adults was chosen to evaluate the performance of a candidate during a presidential debate. Each member of the group rated the overall performane on a scale of 1 (poor) to 10 (superior). The ratings given the candiates were as follows:
4 5 8 7 9 8 7 3 6 7
Calculate the (a) range (b) mean deviation (c) variance and standard deviation for these rating scores. This question is from textbook Elementary Statistics in Social Research
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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
