Question

Listed in the data table are amounts of strontium-90 (in millibecquerels, or mBq, per gram of calcium) in a Simple random sample of baby teeth obtained from residents in two cities. Assume that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal. Complete parts (a) and (b) below Click the icon to view the data table of strontium-90 amounts.

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Answer 1

Answer)

First we need to estimate the mean and s.d for both city 1 and city 2

For city 1

u1 = 151.5

S1 = 72.6304

For city 2

u2 = 114.3333

S2 = 33.9554

N1 = N2 = 12

Test statistics t = (u1-u2)/standard error

Standard error = √{(s1^2/n1)+(s2^2/n2)}

After substitutioN

Test statistics is = 1.60583833071 = 1.61