A study was designed to investigate the effects of two variables - (1)a studentʹs level of mathematical anxiety and (2)teaching method - on a studentʹs achievement in a mathematics
Course. Students who had a low level of mathematical anxiety were taught using the traditional
Expository method. These students obtained a mean score of 480 with a standard deviation of 30
On a standardized test. Assuming a mound-shaped and symmetric distribution, in what range
Would approximately 68% of the students score?
A)between 450 and 510
B)above 510
C)below 510
D)below 450 and above 510

Question

Quizplus · Accepted Answer

The range where approximately 68% of the students would score is one standard deviation away from the mean in both directions, which is between 450 (480 - 30) and 510 (480 + 30).

A Study Was Designed to Investigate the Effects of Two