# standard deviation

posted by .

the mean is 3.5. dtandard deviation is .5. sally's score is 1.5 on test. how many standard deviations is she from the mean?
billy scores 5. what is his standard score?
what scale of measurement is being used? is it appropriate? why/why not?

• standard deviation -

The Z score indicates standard deviations from the mean. It is accurate as long as the distribution is normal.

Z = (score - mean)/standard deviation

You can do the calculations.

## Similar Questions

1. ### Stastics

When we convert x-value to z- score and use Standard Normal distribution, which of the following statements is true?
2. ### statistics

Three students take equivalent stress tests. Which is the highest relative score?
3. ### statistics

Three students take equivalent stress tests. Which is the highest relative score?
4. ### statistics

The distribution score for a city wide math test scores results in a mean of 70 and a standard deviation of 12. What score is 2 standard deviations above the mean?
5. ### MATH

A mean score on a standardized test is 50 with a standard deviation of 10. Answer the following a. What scores fall between –1 and +1 standard deviation?
6. ### statistics

a mean score on a standardized test is 50 with a standard deviation of 10. What are the following: 1. what scores fall between -1 and +1 standard deviation?
7. ### statistics

So if a depression scale has 30 items in it, and if an individual gets a score of 20 what does this mean?
8. ### statistics

So if a scale has 30 items in it, and if an individual gets a score of 20 what does this mean?
9. ### statistics

assuming that you wished to have the highest possible score on an exam relative to ht e other scores, would you rather have a score of 70 on a test with a mean of 60 and a standard deviations of 5.2 or a score of 81 on a test with …
10. ### Foundations of Measurement

Approximately 400,000 students took the GRE in 2009. Observed mean for the Verbal score was 540 with a standard deviation of 80, and the observed mean quantitative score was 500 with a standard deviation of 100. Assuming distribution …

More Similar Questions