Imagine you just bought a new scale and want to make sure it works well. To test it, you decide to weigh a 10lb exercise weight five times. You know for certain that the weight is 10lbs. Your scale gives you the following results: 5lbs, 11lbs, 8lbs, 15lbs, and 3lbs. What can we say about your new scale?

Question

BlackTom AI · Accepted Answer

The question presents a scenario where a known 10 lb weight is measured five times, yielding results: 5 lbs, 11 lbs, 8 lbs, 15 lbs, and 3 lbs. This setup tests both validity (accuracy to the true value) and reliability (consistency of repeated measurements).

Option A: 'It is valid but not reliable.' This would require that the measurements are centered around the true value (accurate on average) but vary from trial to trial. In this case, the measurements are far from the true weight (ranging from 3 to 15 lbs) and do not cluster around 10 lbs, so the scale is not valid. Additionally, the results are not consistently close to each other, so reliability is also questionable. Therefore this option is incorrect.

Option B: 'It is neither valid nor reliable.' Validity is about accuracy to the true weight; the five measurements are wildly off from 10 lbs on average, so not valid. Reliability is about consistency across measurements; the outcomes are highly variable (5, 11, 8, 15, 3), showing poor consistency. Taken together, this option correctly describes the scale as lacking both validity and reliability.

Option C: 'It is reliable but not valid.' This would mean measurements are consistent with each other even if they’re off from the true value. Here, the measurements are not consistent (they span a wide range from 3 to 15 lbs), so this option is false.

Option D: 'It is both reliable and valid.' This would require both accuracy to 10 lbs and consistency across trials. Given the large spread and bias away from 10 lbs, neither condition is met, so this option is incorrect.

In summary, the observed results fail to approximate the true weight and show substantial inconsistency, which aligns with the conclusion that the scale is neither valid nor reliable.

psyc_468_120251_243897 Week 2 Quiz

查看解析

登录即可查看完整答案

类似问题

When conducting research, _ is the strength of the conclusions, while __ is the level of consistency of the measurement.

Which of the following is true about a study that is valid and reliable?

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

Economic stress and unpredictable times have resulted in a booming industry for self-help products

People born without creativity never can develop it

A product has a selling price of $20, a contribution margin ratio of 40% and fixed cost of $120,000. To make a profit of $30,000. The number of units that must be sold is: Type the number without $ and a comma. Eg: 20000

Which of the following statement regarding cost is correct:

Under the assumptions used in cost-volume-profit analysis, as the activity increases:

更多留学生实用工具

考试浏览器助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单