Monday

December 22, 2014

December 22, 2014

Posted by **Anonymous** on Sunday, May 6, 2012 at 12:12am.

- statistics -
**PsyDAG**, Sunday, May 6, 2012 at 3:39amFind the mean first = sum of scores/number of scores

Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.

Standard deviation = square root of variance

90% = mean ± 1.645 SEm

SEm = SD/√n

I'll let you do the calculations.

**Answer this Question**

**Related Questions**

Math Statistics - 5. Students in an introductory statistics class were asked to ...

statistics - Randomly selected students participated in an experiment to test ...

statistics - The Frayed Nerves Anxiety Scale (FNAS) is used to measure the ...

Statistics - A random sample of 50 students chosen from an elementary school ...

AP Statistics - A school psychologist reports that the mean number of hours the ...

statistics - Can someone guide me on how to solve this problem: A sample of 52 ...

Statistics - A confidence interval was used to estimate the proportion of ...

Math Statistics - Students enrolled in an introductory statistics course at a ...

Statistics - You want to know if there's a difference between the proportions ...

Stats - Twenty randomly selected students took the statistics final. If the ...