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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 400

400 with a standard deviation of 30

30 on a standardized test. Assuming no information concerning the shape of the distribution is​ known, what percentage of the students scored between 340

340 and 460


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95.44 percentage of the... View the full answer

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