I think question 1 and 3 are right, but I confused myself on question 2. Data is

Question

I think question 1 and 3 are right, but I confused myself on question 2. Data is:

PowerPoint Tutorial AuthorGen Tutorial ABC Tutorial 68 79 75 85 86 83 91 82 78 87 92 86 88 91 81 Question 1 (Mandatory) (12 points) UMUC plans to use a new tutorial to teach the students about business ethics. As an experiment, the administrator randomly selected 15 students, and randomly assigned them to one of three groups: a PowerPoint presentation created by the faculty, AuthorGen Presentation created by the faculty, or a well known tutorial by the ABC company. After completing their assigned tutorial, the students are given a Business Ethics test(Click on link). Use Excel Data Analysis at a 0.01 to decide which tutorial to use? Keep the Excel file open for the next two questions. A) F-0.834 Fcrit 3.885 B) F0.834 Fcrit 0.692 D) F= 0.684

Explanation / Answer

Hypothesis are
H0: all three population means are equal
H1: At least two population means are different.

Output of ANOVA analysis is

#1. Option B is correct

#2. Option A is correct

#3. Option B is correct.

Here we have F statistic is less than the critical value, hence we fail to reject the null hypothesis. This means there are not significant evidence to conclude that mean scores are different.

Anova: Single Factor SUMMARY Groups Count Sum Average Variance PowerPoint Tutorial 5 419 83.8 82.7 AuthorGen Tutorial 5 430 86 31.5 ABC Tutorial 5 403 80.6 18.3 ANOVA Source of Variation SS df MS F P-value F crit Between Groups 73.733 2 36.867 0.835 0.458 6.927 Within Groups 530 12 44.167 Total 603.733 14

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