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英文統計數學sampling
仲可以幫下我嗎?A school plans to conduct an intelligence test for the primary one student in the coming school year. Suppose the school will have 200 new comers, for which 85 of them are boys.(a)The school principal plans to randomly select 20% new comers to join the intelligence test. i.What can be used as... 顯示更多 仲可以幫下我嗎? A school plans to conduct an intelligence test for the primary one student in the coming school year. Suppose the school will have 200 new comers, for which 85 of them are boys. (a)The school principal plans to randomly select 20% new comers to join the intelligence test. i.What can be used as the sampling frame? ii.What is the sampling method? iii.What is the sample size? (b) A teacher suggests randomly selecting 20% of boys and girls respectively. i.What is the sampling method? ii.How many girls should be selected for the test? iii.What is the advantage of using this method over the method in (a)(ii)? 請列式==" 英文統計mean standard deviation 可以幫下我嗎? 2.A factory produces steel rods that are used to reinforce concrete. The production process is known to produce rods that are normally distributed with a mean length of 300 cm and a standard deviation of 8 cm. (a) One rod is randomly selected for quality checking. i.What is the probability that a randomly selected rod has a length longer than 315 cm? ii.If 22% of the rods are more than a specific length L, find L. (a)14 rods are randomly selected for quality checking. i.What are the mean and standard deviation of the sample mean length? ii.What is the probability that the sample mean length will be between 297 cm and 305 cm? iii.If 22% of the sample means are more than a specific length L, find L. 請列式=="
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Please read: 圖片參考：http://imgcld.yimg.com/8/n/HA00430218/o/20131103191055.jpg 圖片參考：http://imgcld.yimg.com/8/n/HA00430218/o/20131103184624.jpg
其他解答:A9A3995907B431A4
英文統計數學sampling
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發問:仲可以幫下我嗎?A school plans to conduct an intelligence test for the primary one student in the coming school year. Suppose the school will have 200 new comers, for which 85 of them are boys.(a)The school principal plans to randomly select 20% new comers to join the intelligence test. i.What can be used as... 顯示更多 仲可以幫下我嗎? A school plans to conduct an intelligence test for the primary one student in the coming school year. Suppose the school will have 200 new comers, for which 85 of them are boys. (a)The school principal plans to randomly select 20% new comers to join the intelligence test. i.What can be used as the sampling frame? ii.What is the sampling method? iii.What is the sample size? (b) A teacher suggests randomly selecting 20% of boys and girls respectively. i.What is the sampling method? ii.How many girls should be selected for the test? iii.What is the advantage of using this method over the method in (a)(ii)? 請列式==" 英文統計mean standard deviation 可以幫下我嗎? 2.A factory produces steel rods that are used to reinforce concrete. The production process is known to produce rods that are normally distributed with a mean length of 300 cm and a standard deviation of 8 cm. (a) One rod is randomly selected for quality checking. i.What is the probability that a randomly selected rod has a length longer than 315 cm? ii.If 22% of the rods are more than a specific length L, find L. (a)14 rods are randomly selected for quality checking. i.What are the mean and standard deviation of the sample mean length? ii.What is the probability that the sample mean length will be between 297 cm and 305 cm? iii.If 22% of the sample means are more than a specific length L, find L. 請列式=="
最佳解答:
Please read: 圖片參考：http://imgcld.yimg.com/8/n/HA00430218/o/20131103191055.jpg 圖片參考：http://imgcld.yimg.com/8/n/HA00430218/o/20131103184624.jpg
其他解答:A9A3995907B431A4
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