Question

Method

Null hypothesis	H₀: All means are equal
Alternative hypothesis	H₁: At least one mean is different

Equal variances were assumed for the analysis.

Factor Information

Factor	Levels	Values
StressLevel	3	High, Low, Medium

Analysis of Variance

Source	DF	Adj SS	Adj MS	F-Value	P-Value
StressLevel	2	261.361	130.681	18.76	<0.0001
Error	69	480.583	6.965
Total	71	741.944

Model Summary

S	R-sq	R-sq(adj)	R-sq(pred)
2.63912	35.23%	33.35%	29.47%

Means

StressLevel	N	Mean	StDev	95% CI
High	24	5.2083	2.6536	(4.1336, 6.2830)
Low	24	9.8750	2.7077	(8.8003, 10.9497)
Medium	24	7.5000	2.5538	(6.4253, 8.5747)

Pooled StDev = 2.63912

For this assignment, use data from W1 Project.

This week, you will explore the hypothesis that recall will vary as a function of stress levels.

Conduct an ANOVA comparing participants' Recall1 across all three stress-level conditions (low, medium, and high).

Conduct post hoc tests if needed, using the Tukey method.

Move your output into a 1- 2-page Microsoft Word document and write a short, APA-formatted interpretation of the results.

Answer 1

Sol: