# Statistics

posted by
**Jake**
.

Check my answers please!

Thanks a lot.

Five students reported that the previous night they slept: 7,8,7,10,9 hours.

Calculate the sample varience and standard deviation.

sample varience = 1346.5

standard deviation = 36.7

Consider this. Ths standard deviation can *never* be larger than the range of scores. Assuming that you are still talking in hours, you answer is much larger.

mean = 8.2

Differences obtained by subtracting the score from the mean =

1.2

.2

1.2

-1.8

-.8

Squaring each of these gives you

1.44

.04

1.44

3.24

.64

Totaling 6.8. Dividing this by N (5) gives you 1.36 = variance

The square root of the variance is the standard deviation.

I hope this helps. Thanks for asking.