A can be calculated by subtracting the mean for the second “Diff” group from the mean for the first group. It can be positive or negative. Above or below the middle The distribution of values will be centered at . “Diff” The shape of the distribution of values will be symmetrical and “Diff” approximately normal. (In Booklet): Statistical Significance Statistically significant that the difference you found did not occur by chance. It means there actually is a difference in the means and you showed what you were trying to show. If a Diff is not statistically significant, this means that the difference occurred by chance and the means are in fact equal. values that are closer to are more likely to happen by chance. “Diff” “Diff” values further from 0 are less likely to happen by chance. A Diff value is statistically significant if there is a low probability (less than ) of obtaining a result that is as extreme as or more extreme than that value. (In Booklet): Interpreting the Difference Value a. Explain what a Diff value of ounces would mean in terms of which group has the larger mean weight and the number of ounces by which that group’s mean weight exceeds the other group’s mean weight. b. Explain what a Diff of ounces would mean in terms of which group has the larger mean weight and the number of ounces by which that group’s mean weight exceeds the other group’s mean weight. c. Explain what a Diff value of ounces would mean regarding the difference between the mean weight of the tomatoes in Group A and the mean weight of the tomatoes in Group B. (In Booklet): Determining Statistical Significance
A “Diff” can be calculated by subtracting the mean for the second group from the mean for the first group. It can be positive or negative. Above or below the middle The distribution of “Diff” values will be centered at . The shape of the distribution of “Diff” values will be symmetrical and approximately normal. (In Booklet): Statistical Significance Statistically significant that the difference you found did not occur by chance. It means there actually is a difference in the means and you showed what you were trying to show. If a Diff is not statistically significant, this means that the difference occurred by chance and the means are in fact equal. “Diff” values that are closer to are more likely to happen by chance. “Diff” values further from 0 are less likely to happen by chance. A Diff value is statistically significant if there is a low probability (less than ) of obtaining a result that is as extreme as or more extreme than that value. (In Booklet): Interpreting the Difference Value a. Explain what a Diff value of ounces would mean in terms of which group has the larger mean weight and the number of ounces by which that group’s mean weight exceeds the other group’s mean weight. b. Explain what a Diff of ounces would mean in terms of which group has the larger mean weight and the number of ounces by which that group’s mean weight exceeds the other group’s mean weight. c. Explain what a Diff value of ounces would mean regarding the difference between the mean weight of the tomatoes in Group A and the mean weight of the tomatoes in Group B. (In Booklet): Determining Statistical Significance
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