Aside from looking at how high or how low the class standings are, Prof. Juan is also interested inknowing if student performance varies significantly. This is not necessarily a bad indicator. In fact,variation in student performance may reflect the discriminatory ability of course assessments. In thepast (face-to-face set-up), it is common to encounter some extreme class standings and disparities inthe scores. Prof. Juan thinks this is not the case now and that the variance of class standings is lessthan the usual, 100 squared points. Below is the R Commander output to help clarify Prof. Juan'shypothesis.R COMMANDER OUTPUTOne sample Chi-squared test for variancedata:CLASS STDGX-squared =alternative hypothesis: true variance is less than 1007.7585, df =49, p-value= 2.095e-12

Null Hypothesis: H0: The true variance is not less than 100. Alternative Hypothesis: H1: The true…

Answered: Aside from looking at how high or how…

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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Professor Hayashi has implemented a new book for his Fall 2013 statistics course. He wants to see if the new book has an effect on the exam average for Exam 3. He knows that the Exam 3 mean for all students who have taken his statistic course over the past 10 years is 77.2. He collects some data from a sample of 9 students and finds that the Exam 3 mean for his Fall 2013 statistics students is 81.7 with a variance of 32.49.Measure effect size using Cohen's D.
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Avalanches can be a real problem for travelers in the western United States and Canada. Slab avalanches studied in Canada had an average thickness of u = 67 cm. A sample of 31 avalanches in the U.S. gave a sample mean of = 63.0 cm. It is known that o = 10.3 cm for this type of data. Use a 0.03 level of significance to test the claim that the mean slab thickness of avalanches in the United States is different from that in Canada. Use the P-Value Approach. What are the hypotheses for this problem? А: Но и 3D 63.0 ст us На и + 63.0 ст B: Но и 63.0 ст С: Но и %3D 67 ст us HA и < 67 ст D: Ho u = 67 cm vs HA H# 67 cm B O A

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