Use the Empirical Rule to Describe Data That Are Bell $68 \%$

question 106

Multiple Choice

Use the Empirical Rule to Describe Data That Are Bell Shaped
-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 490 with a standard deviation of 20 on a standardized test. Assuming a bell-shaped distribution, where would approximately $68 \%$ of the students score?

• A) between 470 and 510
• B) between 450 and 530
• C) below 450 or above 530
• D) below 470 or above 510