Give an example of a research question that involves comparing two independent means. Explain why it is appropriate for an independent samples t-test to be used. Based on the data and situation below, find the 95% confidence interval on ...
解析 B。本题考查市场调研中的样本类型。选项 A“random sample”是随机样本;选项 B“representative sample”是具有代表性的样本,能代表整个总体;选项 C“convenience sample”是便利样本;选项 D“stratified sample”是分层样本。在市场调研中,能代表整个总体的样本是具有代表性的样本。
A选项只选择母语者,这样的样本太单一,不能全面反映各种英语发音情况,因为还有很多非母语者也有不同的发音特点。B选项选取有留学经历的人,这只是一部分特定人群,不能代表所有英语发音的情况。C选项挑选擅长模仿声音的人,这是一个有偏向性的选取方式,不能涵盖正常的发音情况。D选项从不同英语背景下随机选择个体,这样...
large national random sample of ….意思是：全国大型的随机抽样，这里的sample 作为一种行动， 不用复数。例如：We based our analysis on random sample of over 300 males .
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4.The term “sample” is prominently used in statistics and quantitative research as a descriptive term. In this discipline, “sample” is a small amount of randomly selected respondents from a population. On the other hand, examples are generally used in almost all disciplines that ...
A market research firm asks a random sample of 240 adults and students at a movie theater whether they would rather see a new summer blockbuster in 2-D or 3-D. The survey shows that 64 adults and 108 students prefer 3-D, while 42 adults and 26 students prefer 2-D. (1)Organize the...
A. select a sample B. define the scope C. conduct a survey D. draw conclusions 相关知识点: 试题来源: 解析 B。在科研项目中,首先要确定范围。选项 A 选择样本在确定范围和研究方法后。选项 C 进行调查在确定研究方法后。选项 D 得出结论是在项目后期。反馈...
这一类应该是针对大多数吧,从零开始对于各位也有两种选择,一种是literature+reflection of one's own experience and practice+implications,这类呢就是从理论出发谈某一方面并结合自己实际,批判分析,得出建议;另一类就是develop a research proposal,胖豆个人比较prefer这种,前不久和一研究写作测试的老师联系,她就比较...
Related to this Question How can you reduce the skew in a distribution where there are just a few outliers far on the upper end of the data distribution? The purpose of a single-sample t-test is to compare: a. a sample mean with a popul...