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Question 1. Question : In ANOVA analyses, when the null hypothesis is rejected, we can test for differences between treatment means by _____________. Student Answer: Constructing confidence intervals Adding another treatment
Doing an additional ANOVA Doing a ttest Instructor Explanation: When the null hypothesis is rejected, we conclude that at least one pair of treatment means differs. By constructing confidence intervals, we can identify which pairs of means differ. Points Received: 1 of 1Comments: Question 2. Question : An electronics company wants to compare the quality of their cell phones to the cell phones from three competitors. They sample 10 phones from each company and count the number of defects for each phone. If ANOVA was used to compare the average number of defects, then the treatments would be defined as: Points Received: 1 of 1Comments: Question 3. Question : The annual dividend rates for a random sample of 16 companies in three different industries, utilities, banking, and insurance were recorded. The ANOVA comparing the mean annual dividend rate among three industries rejected the null hypothesis that the dividend rates were equal. The Mean Square Error (MSE) was 3.36. The following table summarized the results: Based on the comparison between the mean annual dividend rate for companies in utilities and banking, the 95% confidence interval shows an interval of 1.28 to 6.28 for the difference. This result indicates that _____________________.