Posted by **Jake** on Thursday, February 1, 2007 at 12:35pm.

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.

## Answer This Question

## Related Questions

- Statistics: Sample Size, Variance and Standard Dev - Sample Size, Variance and ...
- statistics - what are the mean and standard deviation of a sampling distribution...
- Statistics - data from sample of 400 cases, variable has 95% confidence interval...
- statistics - Given a sample size of 38, with sample mean 660.3 and sample ...
- statistics - The mean length of a work week for the population of workers was ...
- statistics - A student was asked to compute the mean and standard deviation for ...
- Statsistics - You are testing the claim that the mean GPA of night students is ...
- AP Statistics - A school psychologist reports that the mean number of hours the ...
- statistics - A researcher administered a treatment to a sample of participants ...
- statistics - An SRS of size n is taken from a large population whose ...

More Related Questions