import scipy.stats as stats
import math
# Specify the number of occurences (x), the sample size (n), and the proportion claimed in the null-hypothesis (p)
x = 10
n = 100
p = 0.5
# Calculate the sample proportion
p_hat = x/n
# Calculate and print the test statistic
print((p_hat-p)/(math.sqrt((p*(1-p))/(n))))
-8.0