Table 3 Statistical analysis against chance level for Congruency Effect for each population in the Decreasing Task instruction of Experiment 2

From: A left-to-right bias in number-space mapping across ages and cultures

Two-tailed one-sample T test (µ = 0)

Group

Descriptive statistic

Test statistic

 

N

Mean

SD

Df

t-value

pvalue

95% CI

Effect size

Himba Adults 2021

33

0.052

0.096

32

3.129

0.004

[0.018 0.086]

0.545

Himba Adults 2022

78

0.022

0.083

77

2.267

0.026

[0.003 0.041]

0.257

Italian Preschoolers

38

0.042

0.091

37

2.824

0.008

[0.012 0.072]

0.458

Two-tailed one-sample Wilcoxon signed rank test (µ = 0)*

Group

Descriptive statistic

Test statistic

 

N

Median

IQR

Df

W-value

pvalue

95% CI

Effect size

Italian Adults

47

0.034

0.045

46

918

<0.001

[0.016 0.038]

0.55

  1. *Non parametric analysis was conducted for data not normally distributed.