Preparation
To prepare for this discussion, follow along with our ScreenCast videos 12.8 and 12.8.2 to make sure you can generate all of the required results.
Required SPSS Videos
Stats 3e Screencast 12.8 (shows how to get a One-Way Anova from the “compare means” menu)
Use this NICE video (click here) to see how to calculate EFFECT SIZE for the One-Way Anova (Eta squared, partial Eta Squared). This will also require that you use the steps in video 12.8.2 as the way to generate your One-Way Anova
[Paper] Analysis of variance (ANOVA) comparing means of more than two groups” (click here)
There are any number of youtube videos for interpreting One-Way Anova tables, so if you want to hear more, go to Youtube and take your pick. Videos use different versions of SPSS, but the main theory for reading the ouptut is the same.
A power-point presentation (click here) on running and interpreting One-Way Anova in SPSS
Here, you will create a mock study and write up the results as a mini-paper.
You may use the scenario you thought up in the first discussion of the week, based on Paul Bloom’s TED.com talk, or you can use a different example.
We are going to share these mini-reports with each other as a discussion so everybody will be able to see each others’ examples and therefore have a better idea of how to run statistical tests and write up the results. If you are stumped on how to write your post, look at what others have written but change the example hypothesis to one which interests you.
This will help accomplish our course themes/goals of 1) asking and answering questions with statistics, 2) telling stories with data, and 3) choosing the correct statistical test.
In relation to choosing a statistical test, make sure to start looking at resources which show a variety of approaches. In these mini-reports, there is only one correct answer for what test to choose, the One-Way Anova this week, but we need to develop your understanding of how to match the research question, variables, hypotheses, number of variables, and scales of measurement with the choice of the correct test. Please review these resources throughout the week.
Video- https://www.youtube.com/watch?v=UaptUhOushw Documents: 1) http://www.biostathandbook.com/testchoice.html , 2) https://www.graphpad.com/support/faqid/1790/ , 3) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3116565/ 4) https://www.dataanalytics.org.uk/data-analytics-knowledge-base-tips-tricks-r-excel/statistics-guide/which-statistics-test/ , 5) an infographic showing a few options.
To complete this assignment, you are asked to generate a scenario that would require the use of a One-Way Anova, write your research question and matching hypothesis, generate fake/mock data, enter that correctly into SPSS, calculate and explain your results. It would be best to write your replies in MS word, save them, and paste them into this discussion so you don’t lose any work.
Title
(2 points) Brief introduction to the scenario (explain what you are comparing, what the variables are and what your null and alternative hypotheses are.
List the independent variable’s name ____ how many levels it has _____ and what those levels are ______. See this link if you are stumped. https://www.statisticshowto.datasciencecentral.com/probability-and-statistics/hypothesis-testing/anova/
Provide an operational definition for the independent variable (yes, even categorical independent variables need operational definitions).
List the dependent variable’s name and its operational definition_____. Is this an interval or ratio scale measurement?
(3 pts) Brief explanation of the methods
explain the sample size, sampling method, and measurement methods you might use to have collected the mock data for your study. Use about 20-30 data points per group.
explain the descriptive statistics and charts which you might use to first analyze the data and check the sample for outliers and normality
list your choice of alpha level and explain that choice. Will you use the standard p<.05 level or a different criterion and why?
Explain what post-hoc tests you used and why they were used.
(3 pts) Results [Hint, see: this power-point presentation (click here) on running and interpreting One-Way Anova in SPSS]
List the descriptive statistics for your data. List any charts which accompany them.
Paste in the Anova results table for your data
Report the descriptive statistics (means and standard deviations) and the inferential statistics (One-Way Anova results) in APA format. http://statistics-help-for-students.com/How_do_I_report_a_1_way_between_subjects_ANOVA_in_APA_style.htm
Explain whether or not you rejected the null hypothesis and why
Use this NICE video (click here) to see how to calculate EFFECT SIZE for the One-Way Anova (Eta squared, partial Eta Squared). This will also require that you use the steps in video 12.8.2 as the way to generate your One-Way Anova
(2 pts) Interpretation
Write a brief description of your results and what it means about your research question.
Was there a difference between the means you looked at and what would that tell you about the primary research question? Interpret the effect size measures.
