Researchers conducted a study to determine whether magnets are effective in treating back pain. The results are shown in the table for the treatment​ (with magnets) group and the sham​ (or placebo) group. The results are a measure of reduction in back pain. Assume that the two samples are independent simple random samples selected from normally distributed​ populations, and do not assume that the population standard deviations are equal. Complete parts​ (a) and​ (b) below.

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Researchers conducted a study to determine whether magnets are effective in treating back pain. The results are shown in the table for the treatment​ (with magnets) group and the sham​ (or placebo) group. The results are a measure of reduction in back pain. Assume that the two samples are independent simple random samples selected from normally distributed​ populations, and do not assume that the population standard deviations are equal. Complete parts​ (a) and​ (b) below.
Treatment
Sham
   
 
μ
μ1
μ2
n
25
25
x
0.53
0.42
s
0.68
1.13
a.  Use a
0.05
significance level to test the claim that those treated with magnets have a greater mean reduction in pain than those given a sham treatment.
 
What are the null and alternative​ hypotheses?
 
 
A.
H0​:
μ1<μ2
H1​:
μ1≥μ2
 
B.
H0​:
μ1=μ2
H1​:
μ1>μ2
 
C.
H0​:
μ1=μ2
H1​:
μ1≠μ2
 
D.
H0​:
μ1≠μ2
H1​:
μ1<μ2
 
 
 
The test​ statistic, t, 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.
 
 
(Fail to reject OR Reject)
the null hypothesis.
There (Is OR is not)
sufficient evidence to support the claim that those treated with magnets have a greater mean reduction in pain than those given a sham treatment.
Is it valid to argue that magnets might appear to be effective if the sample sizes are​ larger?
 
Since the
(sample mean OR sample standard deviation)
for those treated with magnets is (equal to OR greater than OR
less than)
the sample mean for those given a sham​ treatment, it (is OR is not)
valid to argue that magnets might appear to be effective if the sample sizes are larger.
 
 
b. Construct a confidence interval suitable for testing the claim that those treated with magnets have a greater mean reduction in pain than those given a sham treatment.
 
_______<μ1−μ2<_____
​(Round to three decimal places as​ needed.)
 
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