题目
题目

FA25_QTM_100_3 7.24: Diamonds, Part I.- Requires Respondus LockDown Browser

单项选择题

What is the test statistic? Remember that our sample statistic is ( x ̄ 0.99 − x ̄ 1 ) . 

选项
A.-2.82
B.2.82
C.-12.3
D.2.07
E.-2.07
查看解析

查看解析

标准答案
Please login to view
思路分析
First, parse the problem: the question asks for the test statistic, which is given as the difference between two sample means, specifically (x̄0.99 − x̄1). The task is to select the numeric value that matches this computed statistic from the provided options. Option -2.82: This value differs in magnitude and sign from the given statistic. If the computed difference is negative, a value like -2.82 would only be correct if the first mean were smaller than the......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

A student researcher is interested in knowing whether or not the first-year college students and seniors spend the same amount of time studying in addition to doing the homework each week. To investigate this, random samples were drawn from both the first-years and the seniors from a college: the sample mean for the first-year students is 3.5 hours, and the sample mean for the seniors is 4.2 hours. A hypothesis test was conducted with 𝐻 0 : 𝜇 𝑓 𝑖 𝑟 𝑠 𝑡 − 𝑦 𝑒 𝑎 𝑟 − 𝜇 𝑠 𝑒 𝑛 𝑖 𝑜 𝑟 = 0 , 𝐻 𝑎 : 𝜇 𝑓 𝑖 𝑟 𝑠 𝑡 − 𝑦 𝑒 𝑎 𝑟 − 𝜇 𝑠 𝑒 𝑛 𝑖 𝑜 𝑟 ≠ 0 , and yielded a p-value of 0.04. Given the result, which is the appropriate decision against the null hypothesis at the 0.05 significance level? Also, which of the following is the best conclusion of this hypothesis test?

Each year the US Environmental Protection Agency (EPA) releases fuel economy data on cars manufactured in that year. Below are summary statistics on fuel efficiency (in miles/gallon) from random samples of small cars with manual and automatic transmissions. Which of the following statements is true if we were to decide whether or not these data provide strong evidence of a difference between the average fuel efficiency of cars with manual and automatic transmissions in terms of their average city mileage? Assume that conditions for inference are satisfied. Automatic Manual Mean 32.4 28.8 Standard Deviation 2.12 5.75 n 27 26

A two-sided independent samples t-test with n1=33 and n2=38 yielded a test statistic of 2.03. Assuming unequal variances, which of the following is the correct p-value for this hypothesis test? Be sure to find the p-value using the t-distribution probability table.

A researcher was interested in comparing the response times of two different cab companies. Companies A and B were each called at 50 randomly selected times.  The calls to company A were made independently of the calls to company B. The response times for each call were recorded. The summary statistics were as follows: Use a 0.01 significance level to test the claim that  the mean response time for company A is the same as  the mean response time for company B.  Based on the sample standard deviations, it seems safe to assume that the variances are the same. The data is listed below.   Complete the following analysis. 1. This is a [ Select ] right two left -tailed test. 2. The test statistic is equal to t=2.248 . 3. The P-value is equal to [ Select ] 0.08211405 0.02681 0.09728 . 4. [ Select ] Fail to reject Reject the null hypothesis. 5. At the 1% significance level, it [ Select ] appears that does not appear that the mean response time for company A is different from the mean response time for Company B.   A - 6.424 , 7.768 , 6.088 , 10.12 , 7.936 , 6.088 , 8.272 , 8.608 , 8.44 , 6.928 , 9.952 , 8.104 , 6.424 , 3.736 , 9.28 , 7.432 , 7.432 , 8.944 , 8.776 , 8.44 , 8.944 , 8.776 , 7.6 , 4.072 , 8.44 , 7.264 , 7.096 , 4.912 , 6.592 , 8.104 , 9.784 , 7.264 , 8.104 , 7.264 , 5.08 , 6.76 , 6.76 , 7.264 , 9.28 , 8.776 , 7.096 , 6.928 , 8.608 , 8.44 , 6.256 , 6.256 , 8.104 , 8.776 , 7.264 , 8.944   B - 7.376 , 5.625 , 7.2009 , 4.7495 , 9.127 , 10.1776 , 5.9752 , 4.9246 , 7.7262 , 6.5005 , 10.878 , 6.6756 , 7.9013 , 6.6756 , 5.4499 , 7.0258 , 3.5238 , 9.3021 , 7.0258 , 10.5278 , 7.5511 , 5.4499 , 7.7262 , 5.0997 , 4.3993 , 7.2009 , 5.9752 , 6.6756 , 6.8507 , 5.625 , 5.625 , 6.5005 , 8.7768 , 4.0491 , 7.7262 , 7.2009 , 8.6017 , 6.1503 , 7.376 , 7.2009 , 5.8001 , 8.7768 , 8.7768 , 7.9013 , 9.4772 , 7.7262 , 4.3993 , 5.625 , 4.5744 , 5.8001     c08.p084.q012    

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！