Results

ANCOVA

ANCOVA - Amplitude
	Sum of Squares	df	Mean Square	F	p	η²p
Overall model	56.9	3	18.98	5.21	0.002
Condition	20.2	2	10.12	1.76	0.178	0.042
Stim	36.7	1	36.70	6.40	0.013	0.074
Residuals	458.9	80	5.74

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Assumption Checks

Homogeneity of Variances Tests
	Statistic	df	df2	p
Levene's	3.38	2	81	0.039
Bartlett's	4.37	2		0.112
Note. Additional results provided by moretests

Normality tests
	statistic	p
Shapiro-Wilk	0.983	0.329
Kolmogorov-Smirnov	0.0585	0.920
Anderson-Darling	0.383	0.390
Note. Additional results provided by moretests

Q-Q Plot

Post Hoc Tests

Post Hoc Comparisons - Condition
Comparison
Condition		Condition	Mean Difference	SE	df	t	p_tukey
Bi_AP	-	Bi_LM	-0.499	0.641	80.0	-0.778	0.717
	-	Bi_PA	0.784	0.673	80.0	1.166	0.477
Bi_LM	-	Bi_PA	1.283	0.685	80.0	1.872	0.153
Note. Comparisons are based on estimated marginal means

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Scatterplot

References

[1] The jamovi project (2022). jamovi. (Version 2.3) [Computer Software]. Retrieved from https://www.jamovi.org.

[2] R Core Team (2021). R: A Language and environment for statistical computing. (Version 4.1) [Computer software]. Retrieved from https://cran.r-project.org. (R packages retrieved from MRAN snapshot 2022-01-01).

[3] Fox, J., & Weisberg, S. (2020). car: Companion to Applied Regression. [R package]. Retrieved from https://cran.r-project.org/package=car.

[4] Lenth, R. (2020). emmeans: Estimated Marginal Means, aka Least-Squares Means. [R package]. Retrieved from https://cran.r-project.org/package=emmeans.