I\'m a bit confused why my standard deviation and the calculator\'sdiffer...I ha

Question

I'm a bit confused why my standard deviation and the calculator'sdiffer...I have to show my work so I can't just write down what thecalculator says.

Height (H)
Trial    H (cm)   ?H-H?(cm)    ?H-H?^2(cm)
1    102.9    0.0   0.0
2    102.9    0.0   0.0
3    103.1    0.2   0.04
4    103.0    0.1   0.01
5    102.8    .01   0.01
Total    514.7   .31    .06
Average     102.9   .062    --


Can you tell me what you get for the standard deviation and alsoshow a few intermediate steps so that I can compare what Idid.

Explanation / Answer

Okay so you found the means... You now need to subtract the mean from each value and squareeach result 102.9-102.94 = (-.04)2 = .0016 102.9-102.94 = (-.04)2 = .0016 103.1-102.94 = (.16)2 = .0256 103.0-102.94 = (.06)2 = .0036 102.8-102.94 = (-.14)2 = .0196 Now add up your results and divide by n-1, which in this caseis 5-1 = 4 .052/4 = .013 Square your result and you've got your standarddeviation. .000169

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