P-value

Z-value

Confidence level

Significance level

P < 0.10

Z > 1.65 or Z < −1.65

90%

Significant

P < 0.05

Z > 1.96 or Z < −1.96

95%

Very significant

P < 0.01

Z > 2.58 or Z < −2.58

99%

Extremely significant