def cochran(sd, data, rnge):
z = zScore.zScore(data)
p = PopulationProportion.proportion(sd, data, rnge)
e = MarginError.marginError(sd, data)
q = 1 - p
cochran = (Exponentiation.sqr(z, 2) * p * q) / Exponentiation.sqr(e, 2)
return cochran
def sampleSize(sd, data, percentage):
z = zScore.zScore(sd)
e = MarginError.marginError(sd, data)
p = percentage
q = 1 - p
val = z/e
sample = Exponentiation.sqr(val, 2) * p * q
return sample
def Exponent(self, a, b):
self.Result = Exponentiation.sqr(a, b)
return self.Result