Experimental Design and ANOVA Quiz

Quiz Details

• This quiz assesses understanding of experimental design, ANOVA, and hypothesis formulation.
• Includes scenarios and multiple-choice questions, testing interaction effects and drawing conclusions from statistical significance levels.
• Instructions emphasize reviewing assigned materials.
• Some questions involve analyzing ANOVA results and evaluating main/interaction effects.
• Focus on applying theoretical knowledge to real-world examples.

Question 1

• Description: Examines vocabulary development in 3-year-olds at ages 4 and 5.
• Type: One-way within-subjects design.
• Rationale: One group of subjects, measured multiple times on one dependent variable.

Question 2

• Description: Studies student motivation and its impact on final school average at different grade levels.
• Type: Two-way between-subjects design.
• Rationale: Two factors (motivation, grade level) are compared across different groups.

Question 3

• Description: Examines student motivation over time.
• Type: One-way within-subjects design.
• Rationale: One group of subjects measured multiple times on one dependent variable (motivation).
• One variable measured across three time points by the same subjects.

Question 4

• Description: Examines student motivation and average across elementary school levels.
• Type: Two-way between subjects design
• Rationale: Two factors (motivation, and grade level) are compared across different grade levels with random sampling.

Question 5

• Description: Three different computer keyboard designs are studied (A, B, C).
• Type: One-way between-subjects design
• Rationale: Researchers compares performance on a task varying the keyboard. (A sample, and error measurement).

Question 6

• Decision: Reject null hypothesis.
• Reasoning: Sufficient evidence for a difference in average errors across the three keyboard types (p<alpha).

Question 7

• Analysis: Analyzing the results of a one-way ANOVA design from a human factors study.

Question 8

• Statement: Approximately 60% variability in keyboard errors can be explained by the type of keyboard.
• Rationale: Interpretation of effect size (eta-squared).

Question 9

• Analysis: Three different groups with different keyboards with a comparison of average errors in this analysis.
• Result: Statistically significant difference in average errors between keyboard A and C only at the .05 level.

Question 10 

• Analysis: Describes the hypotheses testing for differences in thinking and/or working proficiency for the humidity main effect.
• Result: The hypothesis describes the difference in proficiency levels across various humidity levels.

Question 11

• Analysis: Using Two-way ANOVA to consider interaction from a research study measuring thinking proficiency. 
• Result: Testing whether the effect of room temperature on thinking performance varies depending on humidity levels.

Question 12

• Analysis: Determine whether a significant difference exists in performance across different temperatures levels(T).
• Hypothesis: Null and alternative hypotheses describe whether there differences across the temperature levels (T) based on research data for proficiency scores.

Question 13

• Analysis: A study investigates the effects of temperature (T) and humidity (H) on thinking or working proficiency.
• Hypothesis: Null and alternative hypotheses describing differences in proficiency based on temperature levels (T).

Question 14

• Analysis: Determining if the effect of room temperature depends on the levels of humidity.
• Result: True, as the lines on the graph are not parallel.

Question 15

• Analysis: Determining if temperature effects on working proficiency differ based on humidity levels.
• Result: True, there is an interaction, as presented in the graph the lines of different humidity levels are not parallel.

Question 16

• Analysis: If approximately 27% of performance variability can be attributed to room temperature.
• Result: True - Using partial-eta squared to calculate the proportion that can be explained and described from the provided ANOVA, (from the source document).