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. Use a 0.05significance level to test the claim that the mean amount of​ strontium-90 from city​ #1 residents is greater than the mean amount from city​ #2 residents.

City_#1	City_#2
102	117
86	62
121	100
120	85
101	80
104	107
213	110
101	111
290	140
100	133
254	101
145	209

The test statistic is ???

​(Round to two decimal places as​ needed.)

The​ P-value is ????

​(Round to three decimal places as​ needed.)

State the conclusion for the test.

A.

Reject the null hypothesis. There is sufficient evidence to support the claim that the mean amount of​ strontium-90 from city​ #1 residents is greater.

B.

Rejectthe null hypothesis. There is notsufficient evidence to support the claim that the mean amount of​ strontium-90 from city​ #1 residents is greater.

C.

Fail to reject the null hypothesis. There is notsufficient evidence to support the claim that the mean amount of​ strontium-90 from city​ #1 residents is greater.

D.

Fail to rejectthe null hypothesis. There is sufficient evidence to support the claim that the mean amount of​ strontium-90 from city​ #1 residents is greater.

Answer 1