Codes of z-test:
p_w = m_above45/m_45orbelow
p_m = w_above45/w_45orbelow
n_w = norm_w
n_m = norm_m
print (”p_w={}, p_m={}, n_w={}, n_m={}”.format(p_w,p_m,n_w,n_m))
print (”z_score={}”.format((p_w-p_m)/sqrt((1/n_w+1/n_m))))