p-Value from z (One-Sided)

Problem

Return the one-sided upper-tail p-value 1 - Phi(z) = 0.5*(1 - erf(z/sqrt(2))) for a standard normal test statistic. Large positive z gives a small p-value.

Hint

Use math.erf for the normal CDF.

Test cases

case 1

in: [0]

expected: 0.5

case 2

in: [1.96]

expected: 0.024997895148220428

case 3

in: [-1.645]

expected: 0.9500150944608786

case 4

in: [2.326]

expected: 0.010009275340867707

case 5

in: [3]

expected: 0.0013498980316301035

Starter codePython

import math
def p_value_z_one_sided(z):
    # Your code here
    pass

5 test cases · run your code against them in the editor