Posted by **STatistic** on Monday, June 28, 2010 at 7:22pm.

Prep Courses? Scores for men (nationwide) on the verbal portion of the SAT test are normally distributed with a mean of 509 and a standard deviation of 112. Randomly selected men are given the Columbia review course before taking the SAT test. After the course, a sample of 49 men revealed an average of 535 points and a standard deviation of 90 points. Using a significance level of 0.05, test the claim that the review course students have a mean score greater than or equal to the normal population. (use the 5-step method).

- statistics -
**PsyDAG**, Tuesday, June 29, 2010 at 11:00am
I don't know what your 5-step method is. Here is what I do.

Z = (mean1 - mean2)/standard error (SE) of difference between means

SEdiff = √(SEmean1^2 + SEmean2^2)

SEm = SD/√(n-1)

If can only calculate one SEm, you can use just that to determine SEdiff.

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

## Answer this Question

## Related Questions

- statistics - Scores for men on the verbal portion of the SAT-1 test are normally...
- Math Helppp - Scores for men on the verbal portion of the SAT-I test are ...
- Finite math - Scores for men on the verbal portion of the SAT-I test are ...
- statistics - Suppose that SAT scores among U.S. college students are normally ...
- math - Test scores on a university admissions test are normally distributed, ...
- STATISTICS - The height of PU men are normally distributed with mean 65 in. and ...
- statistics - It is well known that the heights of individual American men are ...
- Statistics - The serum cholesterol levels in men aged 18 to 24 are normally ...
- statistics - A final exam in Math 157 is normally distributed and has a mean of ...
- stat - assume that the heights of men are normally distributed with a mean of 68...