Given that on one section of the SAT the mean is 500 and the ...

[segrsyd]

Given that on one section of the SAT the mean is 500 and the standard deviation is 100, what is the approximate probability of selecting a student whose score is 400 or lower followed by selecting a student whose score is 500 or higher on the test?
 
  a. 0.005
  b. 0.022
  c. 0.045
  d. 0.08

Question 2

Describe one type of range effect and explain how a range effect can influence the results of a research study.
 
  What will be an ideal response?

[vish98]

Answer to Question 1

d

Answer to Question 2

One example of a range effect is called a ceiling effect and exists when a set of scores all cluster near the top of the scale of measurement. In this case, the scores do not allow room for any noticeable improvement. If a treatment is administered that does improve scores, the improvement will not show up in the results and the researcher will be forced to conclude that the treatment does not appear to produce a significant improvement in scores.

[segrsyd]

Thanks for the timely response, appreciate it

[ecabral0]

Gracias!