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 0.05 significance 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
104 86 121 116 101 104 213 113 290 100 301 145	117 88 100 85 83 107 110 111 121 133 101 209

1. The test statistic is?____ (Round to two decimal places as needed.)

2. The P-value is____ (Round to three decimal places as needed.)

3.

A. Fail to reject? the null hypothesis. There? is not? sufficient evidence to support the claim that the mean amount of strontium-90 from city #1 residents is greater.

B. Fail to 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.

C. 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.

D. Reject? the null hypothesis. There? is not? sufficient evidence to support the claim that the mean amount of strontium-90 from city #1 residents is greater.

4. Construct a confidence interval suitable for testing the claim that the mean amount of strontium-90 from city #1 residents is greater than the mean amount from city #2 residents.? _____mBq<?1??2< ____mbq? (Round to two decimal places as needed.)

5. Does the confidence interval support the conclusion of the test?

yes/no____because the confidence interval contains?positive/negatve/zero values____

Answer 1