दो मॉडलों की तुलना करें

# Compute the difference in adding distance100 variable
diff_deviance_distance = ____.____ - ____.____

# Print the computed difference in deviance
print('Adding distance100 to the null model reduces deviance by: ', 
      round(____,3))

# Compute the difference in adding arsenic variable
diff_deviance_arsenic = ____.____ - ____.____

# Print the computed difference in deviance
print('Adding arsenic to the distance model reduced deviance further by: ', 
      round(____,3))