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29 Sep 2009, 02:21
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No idea how to solve this...........
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29 Sep 2009, 03:46
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I'm not completely sure but I think 6 and 6.
Standard deviation is lower when data points of the set are closer to the mean so if you add two data points which are the same as the mean it should result in a lower SD.
Standard deviation is lower when data points of the set are closer to the mean so if you add two data points which are the same as the mean it should result in a lower SD.
29 Sep 2009, 03:46
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Std. Dev. = sqrt(((a1-mean)^2+(a2-mean)^2....+(an-mean)^2))/n) where an = elements of set.
When we add 2 elements to the set which are exactly the same as mean. We do not change the nominator of the formula and we increase the denominator. Thus, we decrease the std. dev.
Std. Dev. = sqrt(((a1-mean)^2+(a2-mean)^2....+(an-mean)^2))/n) where an = elements of set.
When we add 2 elements to the set which are exactly the same as mean. We do not change the nominator of the formula and we increase the denominator. Thus, we decrease the std. dev.
hope i did it right. 
