04-Chi Squared Test

import codecademylib
import pandas as pd
from matplotlib import pyplot as plt

#8.1
contingency = [[30,146],
               [75,413]]

#8.2
from scipy.stats import chi2_contingency

#8.3
chi2, pval, dof, expected = chi2_contingency(contingency)
print pval
#pval = 0.69, so not significant

#8.4
X =[[5, 73],
   [30,146]]
chi2, pval_reptile_mammal, dof, expected = chi2_contingency(X)
print pval_reptile_mammal
#pval_reptile_mammal = 0.04, so yes, is significant.
#so, yes, certain kinds of species are more likely to be endangered than others. in this case, reptiles.