A Study Was Designed to Investigate the Effects of Two

question 62

Multiple Choice

A study was designed to investigate the effects of two variables - (1) a student's level of mathematical anxiety and (2) teaching method - on a student's 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 390 with a standard deviation of 30 on a standardized test. Assuming a non-mound-shaped distribution, what percentage of the students scored over 480?

• A) at most 11%
• B) at least 89%
• C) approximately 2.5%
• D) at most 5.5%