the means of two sample of sizes 60 and 120 respectively are 35.4 and 30.9 and the standard deviations 4 and 5. obtain the standard deviation of the sample of size 180 obtained by combining the two sample.
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Answer:
The combined standard deviation is 5.15.
Step-by-step explanation:
Given:
The formula to compute combined standard deviation is:
Here is the combined mean.
Formula of combined mean is:
First compute the combined mean:
Now compute the combined standard deviation:
Thus, the combined standard deviation is 5.15.
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