题目
题目
单项选择题

Question at position 4 A civil engineer is testing the reliability of traffic signal controllers produced by two different companies. He has 20 sets of controllers from each company, and he has been given clearance to install them at 40 different intersections in the city. He randomly assigns the controllers from company A to 20 intersections and the controllers from company B to the other intersections. The most important reason for this random assignment is thatrandom assignment eliminates the impact of other variables.random assignment makes the results less variable.random assignment ensures that the study is double-blind.random assignment reduces the impact of outliers.random assignment is a good way to create two groups of similar intersections.

选项
A.random assignment eliminates the impact of other variables.
B.random assignment makes the results less variable.
C.random assignment ensures that the study is double-blind.
D.random assignment reduces the impact of outliers.
E.random assignment is a good way to create two groups of similar intersections.
查看解析

查看解析

标准答案
Please login to view
思路分析
The question asks about the most important reason for random assignment in a randomized study comparing two sets of traffic signal controllers. Option 1: 'random assignment eliminates the impact of other variables.' This overstates what randomization achieves. It reduces the likelihood that confounding variables are systematically distributed between groups, but it does not guarante......Login to view full explanation

登录即可查看完整答案

我们收录了全球超50000道考试原题与详细解析,现在登录,立即获得答案。

类似问题

Question at position 15 Dr. Eva's research team evaluates whether introducing flexible work hours improves employee productivity. They compare employees who voluntarily switched to flexible hours with those who stayed on fixed schedules. How could they best reduce selection bias?Use a double-blind procedureMatch employees in both groups based on job role and tenureRandomly assign employees to work schedulesInclude a placebo group

In matched assignment, participants are assigned to groups (e.g., control, treatment) by chance, ensuring each has an equal likelihood. 

What is the purpose of random assignment in experiments?

In a consumer society, many adults channel creativity into buying things

更多留学生实用工具

加入我们，立即解锁 海量真题 与 独家解析，让复习快人一步！