Question

A teacher wanted to see if social anxiety affects performance on an oral assignment. To examine...

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.

Homework Answers

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.

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