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 0.01 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.
33
City_#1 City_#2
107 117
86 52
121 100
110 85
101 80
104 107
213 110
141 111
290 115
100 133
271 101
145 209
The test statistic is
The P-value
State the conclusion for the test.
a reject, There is sufficient evidence to support the claim that the mean amount of strontium-90 from city #1 residents is greater.
b reject, There is not sufficient evidence to support the claim that the mean amount of strontium-90 from city #1 residents is greater.
c fail to reject, There is sufficient evidence to support the claim that the mean amount of strontium-90 from city #1 residents is greater.
d fail to reject, There is not sufficient evidence to support the claim that the mean amount of strontium-90 from city #1 residents is greater.
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<μ1-μ2<___mBq
Does the confidence interval support the conclusion of thetest?
(yes/no) because the confidence interval contains (zero, only positive values/only negative values)
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