Question 1
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 260 with a standard deviation of 30 on a standardized test. Assuming a mound-shaped and symmetric distribution, what percentage of scores exceeded 200?
◦ approximately 95%
◦ approximately 97.5%
◦ approximately 84%
◦ approximately 100%
Question 2
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 350 with a standard deviation of 40 on a standardized test. Assuming a mound-shaped and symmetric distribution, in what range would approximately 99.7% of the students score?
◦ between 230 and 470
◦ above 470
◦ below 470
◦ below 230 and above 470
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