def cochran(sd, data, rnge):
z = Zscore.zscore(data)
p = PopulationProportion.proportion(sd, data, rnge)
e = MarginError.margin(sd, data)
q = 1 - p
cochran = (Exponentiation.exponent(z, 2) * p * q)/Exponentiation.exponent(e, 2)
return cochran
def sampleSize(sd, data):
e = MarginError.margin(sd, data)
stdDev = StandardDeviation.standardDeviation(data)
val = (1.96 * stdDev) / e
sample = Exponentiation.exponent(val, 2)
return sample
def sampleSize(sd, data, percentage):
z = Zscore.zscore(sd, data)
e = MarginError.margin(sd, data)
p = percentage
q = 1 - p
val = z / e
sample = Exponentiation.exponent(val, 2) * p * q
return sample
def test_MathOperations_exponent(self):
self.assertEqual(81, Exponentiation.exponent(9, 2))
def Exponent(self, a, b):
self.Result = Exponentiation.exponent(a, b)
return self.Result