On the basis of their total scores, 200candidates of a civial service examinationare divided into two groups, the upper 30per cent and the remaining 70 per cent.Consider the first question of thisexamination. Among the first group, 40 hadthe correct answer, whereas among thesecond group, 80 had the correct answer.On the basis of these results, can oneconclude that thge first question is no goodat discriminating ability of the type beingexamined here?

Answered: Image /qna-images/answer/c09fc21a-c38f-453d-bffa-49c674f1b44d.jpg

Answered: On the basis of their total scores, 200…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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6. In March 2010, the Pew Research Group surveyed 1708 adults Americans and asked, "Do you believe the USA was right or wrong to in using military force against Iraq?" Of the 1708 adults surveyed, 1186 stated the USA made the correct decision. In January of 2020, the Pew Research group asked the same question to 1375 adult Americans and found that 934 still share the same opinion that military force was correct. Is there significant evidence to support the claim that this proportion is lower now than it was in 2010? Use alpha = 0.05 a. Set up the Hypotheses and indicate the claim H0: Ha: b. Decision rule. please show the rejected region c. Computation d. Decision e. Interpretation
The State of Virginia has instituted a series of standards of learning (SOL) tests in math, history, English, and science that all high school students must pass with a grade of 70 before they are allowed to graduate and receive their diplomas. The school superintendent of Montgomery County believes the tests are unfair because the test scores are closely related to teacher salary and tenure (i.e., the years a teacher has been at a school). The superintendent has sampled 12 other county school systems in the state and accumulated the following data for average teacher salary and average teacher tenure: a. Using Excel or QM for Windows, develop the multiple regression equation for these data. b. What is the coefficient of determination for this regression equation? Do you think the superintendent is correct in his beliefs? c. Montgomery County has an average SOL score of 74, with an average teacher salary of $27,500 and an average teacher tenure of 7.8 years. The superintendent has…
This research was conducted with Korean adolescents in the Los Angeles area. Would you be willing to generalize the results of this study to Korean adolescents who live in other regions of the country? Why or why not.
There is some research to indicate that different dog breeds differ in emotionality. To consider these differences, a researcher administers a standard test of emotionality to 3 breeds of dogs (German Shepherd, Cocker Spaniel, and Chihuahua), with 4 dogs from each breed being tested. Higher scores mean higher emotionality. The results for the emotionality test scores appear below. Using the 7 steps of hypothesis testing, test the idea that there are differences in emotionality based on dog breed using α = .05 Emotionality Scores for Dogs German Shepherd Cocker Spaniel Chihuahua 6 0 10 1 4 12 7 0 9 2 0 8 T = 16 T = 4 T = 39 Gt = 59 N = 12 ∑x2 = 495 4. Decision Rule (Be sure to include your critical value) 5. Do your calculations 6. Make your decision 7. State your results in a sentence. Report your results in APA style including a measure of effect size. Be sure to include descriptive statistics (M). 8. Given your decision in #7, would…
The admisnistrators of Rowan university wants to know more about the knowledge of students regarding international events. They are concerned that their students are uninformed with regards to the news from other countries. When a standardized test is used to assess the knowledge of all students at al US universities about world events, it is reported that the national mean. A sample of 35 students from Rowan university are tested and the sample mean is 58 and the standard error is 3.2. The 99 percent confidence interval of population mean knowledge of the students at Rowan university has to be determined. 6. The 99 percent confidence interval of the population mean knowledge of the students at Rowan university based on this sample data is?
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The admisnistrators of Rowan university wants to know more about the knowledge of students regarding international events. They are concerned that their students are uninformed with regards to the news from other countries. When a standardized test is used to assess the knowledge of all students at al US universities about world events, it is reported that the national mean. A sample of 35 students from Rowan university are tested and the sample mean is 58 and the standard error is 3.2. The 99 percent confidence interval of population mean knowledge of the students at Rowan university has to be determined. 8. The variance of the national accounting examination score is 900. We want to estimate the sample mean score within 5 points of the population mean score with 99% confidence. The sample size of examinees that will be surveyed to meet these conditions is?

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