求助：为什么人口不同的两个城市抽样人数相同？

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这是悉尼大学的抽样调查概论作业：
题目是：
You are asked to imagine that you are the only statistician working for StudyWell, a firm producing study guides for high school students. The firm has commissioned some market research in NSW and Queensland to estimate what proportion of final year students in each of these states will purchase the StudyWell brand of study guide. The market research company has given a quote based on a sample size of 200 students for each of NSW and Queensland, with a margin of error of 7%.

The manager of StudyWell asks you to explain what this means, and how the figure of 200 for each state has been reached. In particular, he can’t understand why the sample size is the same for the two states when the population size of NSW is much greater than that of Queensland; and he wants to know what “margin of error” means.

Write a memo explaining to your manager these concepts in non-technical language that is appropriate for a non-statistician. Consider using examples to assist your explanation. Your memo should be no more than 2 pages. (A good idea is to try out your explanation on a friend or member of your family who is not trained as a statistician to gauge its effectiveness.)


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关键词：statistician study guide Explanation appropriate Queensland 人口 求助

for you utlizing english,  I have to spell in english also.
admittedly these population are different, but they are not the population in statistics, they will have the same size of students or we utilize the stratum methods, the differen stratum consists different while the sum are same

Thank you so much. U r the best