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A sample of 35 observations has the means 80 and SD. As 4. A second sample of 65 observations from the same population has mean 70 and S.D.3. The S.D. of the combined sample is -A. 5.83B. 5.58C. 34.2D. None of these |
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Answer» Correct Answer - A if `n_(1) =35,barx_(1) =80 , sigma_(1) =4` `n_(2) =65 , barx_(2) =70,sigma_(2) =3` `barx=(35 xx80 +65 xx70)/(35 +65) =73.5` `sigma=sqrt((35(16+42.25)+65(9+12.25))/(100))` `sigma =5.85` |
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