Posted by **Anonymous** on Sunday, September 1, 2013 at 12:25am.

7) A final exam in Statistics has a mean of 73 with a standard deviation of 7.73. Assume that a random sample of 24 students is selected and the mean test score of the sample is computed. What percentage of sample means are less than 70?

- statistics -
**PsyDAG**, Sunday, September 1, 2013 at 1:55pm
Z = (score-mean)/SEm

SEm = SD/√n

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score.

- statistics -
**Linda**, Sunday, March 16, 2014 at 8:47pm
(7.73/SQRT (24) = 1.577879643, next we subtract the data value (70) from the mean (73) as follows (70 – 73 = -3); the values of the two equations are divided as follows (-3/1.577879643 = 1.901285699).

## Answer this Question

## Related Questions

- statistics - a final exam in statistics has a mean of 73 with a standard ...
- stats - A final exam in Math 160 has a mean of 73 with standard deviation 7.73. ...
- statistics - Scores on a national writing exam are approximately normally ...
- Statistics - In Professor Smith's statistics course, the correlation between ...
- statistics - Can you please tell me how to solve for the following? Pedro took ...
- Statistics - 1. The scores of students on the ACT college entrance examination ...
- Statistics - Help me understand this problem, I have several more like this & ...
- Statistics - Students were given an exam with 300 multiple-choice questions. The...
- statistics - Suppose a random sample of 25 students is selected from a community...
- Statistics - Thirty random students took a calc test. If the sample mean was 90...

More Related Questions