Question

A teacher wanted to see if social anxiety affects performance on an oral assignment. To examine this, students completed social anxiety scales and were classified into “low,” “average,” and “high” levels of social anxiety. The data presented in the table below are the oral presentation grades (in percentages) earned by the 45 students separated by their social anxiety classification. Conduct the most appropriate statistical analysis to determine whether grades on the oral assignment differed based on level of social anxiety.

Oral presentation grade (%)
Low social anxiety	Average social anxiety	High social anxiety
72	80	77
68	85	71
73	73	73
75	81	69
97	73	90
73	91	74
95	73	76
88	73	67
89	71	81
97	75	75
88	78	68
89	90	79
93	89	58
89	88	83
79	75	81

1) What is the dependent variable and its scale of measurement in this scenario?

2) State the independent variable in the scenario, its scale of measurement, and its number of levels.

3) Paste appropriate SPSS output.

4) Calculate and interpret the effect size.

5) Paste appropriate SPSS graph, formatted in APA. Write an appropriate figure caption using APA conventions.

6) Write an APA-style Results section based on your analysis. All homework “Results sections” should follow the examples provided in the presentations and textbooks. They should include the statistical statement within a complete sentence that mentions the type of test conducted, whether the test was significant, and a decision about each null hypothesis tested. Include effect sizes, post hoc analyses / interpretations, and refer the reader to Figure(s) created above, when appropriate. 7) Identify a potential confounding variable with the study as it was presented (you can use your imagination!). Justify why you think it may be a confounding rather than an extraneous variable.

Answer 1

1. The Dependent Variable is grades received by the students in oral assignments. The scale of measurement is the percentage of marks obtained by the students in oral assignment.

2. The Independent Variable is social anxiety which is measured using a scale for social anxiety classification .

3. ANOVA
   grades
   	Sum of Squares	df	Mean Square	F	Sig.
   Between Groups	196.311	2	98.156	.537	.589
   Within Groups	7679.333	42	182.841
   Total	7875.644	44

4. According to the results, there is no significant difference between the three groups of anxiety.