In an effort to counteract student cheating, the professor of a large class crea

Question

In an effort to counteract student cheating, the professor of a large class created four versions of a midterm exam, distributing the four versions among the 312 students in the class After the exam, 7 students from the class got together and petitioned to nullify the results on the grounds that the four versions were not equal in difficulty. To investigate the students' assertion, the professor examined the means and variances of the scores on the different versions of the exam, obtaining the following information (the exam had 200 possible points) Taking the 76 scores for each version of the exam as a sample of scores for that version, the professor performed a one-way. independent-samples ANOVA test of the equality of the population mean scores for the four versions Answer the following, carrying your intermediate computations to at least three decimal places and rounding your responses to at least one decimal place

Explanation / Answer

Prepare anova calculator

Mean square error within groups = 145,543.158

Mean square error between groups = 978.900

SS df MS F p Between: 2,936.700 3 978.900 0.007 0.999 Within: 44,827,292.510 308 145,543.158 Total: 44,830,229.210 311

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