(a) What are the means and standard deviations for Maths and Econ?
(b) In previous tests in these two subjects Sue scored marks that were 0.7 standard deviations above the class mean in Maths and 1.1 standard deviations above the class mean for Econ. What assessment should Sue receive for:
a. Maths?
b. Econ?
(c) In which subject does Sue receive the higher mark?
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(Urgent)一條英文Maths standard deviation問題20分呀!!
2007-05-21 7:35 am
回答 (2)
2007-05-22 12:32 am
✔ 最佳答案
a. you need to provide all the scores for Maths and Econ to calculate the means and standard deviations. Or you can calculate it by the use of calculator or excel.b. From normal distribution table, 0.7 standard deviation is equal to 0.258. 0.7 standard deviation above the mean indicates that Sue’s score is higher than 75.8% (0.5 + 0.258) of the class.
And 1.1 standard deviation is equal to 0.3643. 1.1 standard deviation above the mean indicates that Sue’s score is higher than 86.43% (0.5 + 0.3643) of the class.
c. Sue receive the higher mark in Econ as the standard deviation is higher.
2007-05-22 10:07:57 補充：
a. mean for Maths: 67.9655, standard deviation for Maths: 13.0053 mean for Econ: 65.5517, standard deviation for Maths: 12.5412b. From normal distribution table, 0.7 standard deviation is equal to 0.258. And so Sue's assessment for Maths = 67.9655 + 13.0053 * 0.7 = 77.0692
2007-05-22 10:08:05 補充：
And 1.1 standard deviation is equal to 0.3643. And so Sue's assessment for Econ = 65.5517 + 12.5412 * 1.1 = 79.3470c. Sue got higher mark in Econ.
2007-05-23 2:37 am
a) Provide all the scores for Maths and Econ to calculate the means and standard deviations. Calculate it by the use of calculator or excel.
b.) From normal distribution table, 0.7 standard deviation is equal to 0.258. 0.7 standard deviation above the mean indicates that Sue’s score is higher than 75.8% (0.5 + 0.258) of the class.1.1 standard deviation is equal to 0.3643. 1.1 standard deviation above the mean indicates that Sue’s score is higher than 86.43% (0.5 + 0.3643) of the class.
c). Sue receive the higher mark in Economics as the standard deviation is higher.
b.) From normal distribution table, 0.7 standard deviation is equal to 0.258. 0.7 standard deviation above the mean indicates that Sue’s score is higher than 75.8% (0.5 + 0.258) of the class.1.1 standard deviation is equal to 0.3643. 1.1 standard deviation above the mean indicates that Sue’s score is higher than 86.43% (0.5 + 0.3643) of the class.
c). Sue receive the higher mark in Economics as the standard deviation is higher.
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