E-Campus Inferential Statistics - Part 2
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1 E-Campus Inferential Statistics - Part 2 Group Members: James Jones Question 4-Isthere a significant difference in the mean prices of the stores? New Textbook Prices New Price Descriptives 95% Confidence Interval for N Std. Deviation Std. Error Lower Bound Upper Bound Minimum Maximum New Price Test of Homogeneity of Variances Levene Statistic df1 df2 Sig The variances are assumed equal, which was one of the requirements for performing the ANOVA. New Price ANOVA Between Groups Within Groups Sum of Squares df Square F Sig There is no significant difference in the new textbook prices. Page 1
2 Used Textbook Prices Descriptives Used Price 95% Confidence Interval for N Std. Deviation Std. Error Lower Bound Upper Bound Minimum Maximum Used Price Test of Homogeneity of Variances Levene Statistic df1 df2 Sig The variances are assumed equal, which was one of the requirements for performing the ANOVA. Used Price ANOVA Between Groups Within Groups Sum of Squares df Square F Sig There is no significant difference in the used textbook prices. Page 2
3 Best Textbook Prices Descriptives Best Price 95% Confidence Interval for N Std. Deviation Std. Error Lower Bound Upper Bound Minimum Maximum Best Price Test of Homogeneity of Variances Levene Statistic df1 df2 Sig The variances are assumed equal, which was one of the requirements for performing the ANOVA. 70 s Plot 60 of Best Price Bookstore Page 3
4 It appears that,, and are the cheapest stores and that,, and are the most expensive. However, it is important to realize that you can not tell just by looking at the graph, you must use a statistical test to tell. So, we look at the ANOVA. Best Price ANOVA Between Groups Within Groups Sum of Squares df Square F Sig There is a significant difference in the best textbook prices. So, we'll run the Post Hoc tests on the best price to see where these differences lie. The entries in the table with a * next to it are significantly different. Dependent Variable: Best Price LSD Multiple Comparisons (I) Bookstore (J) Bookstore 95% Confidence Interval Difference (I-J) Std. Error Sig. Lower Bound Upper Bound * * E * * * * * * Page 4
5 Multiple Comparisons Dependent Variable: Best Price LSD (I) Bookstore (J) Bookstore 95% Confidence Interval Difference (I-J) Std. Error Sig. Lower Bound Upper Bound * * * * * * * E * * E * E * * * * Page 5
6 Multiple Comparisons Dependent Variable: Best Price LSD Difference 95% Confidence Interval (I) Bookstore (J) Bookstore (I-J) Std. Error Sig. Lower Bound Upper Bound * * * * * * * * * * * * * * * * *. The mean difference is significant at the.05 level. Page 6
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