In a study designed to test the effectiveness of magnets for treating backpain, 35

35 patients were given a treatment with magnets and also a sham treatment without magnets. Pain was measured using a scale from 0(no pain) to 100(extreme pain). After given the magnettreatments, the 35

35 patients had pain scores with a mean of 9.0

9.0 and a standard deviation of 2.7

2.7. After being given the shamtreatments, the 35

35 patients had pain scores with a mean of 10.6

10.6 and a standard deviation of 2.2

2.2. Complete parts(a) through(c) below.

.

a. Construct the 90

90% confidence interval estimate of the mean pain score for patients given the magnet treatment.

What is the confidence interval estimate of the population mean mu

?

nothing

less than

less than

<

nothing

(Round to one decimal place asneeded.)

b. Construct the 90

90% confidence interval estimate of the mean pain score for patients given the sham treatment.

What is the confidence interval estimate of the population mean mu

?

nothing

less than

less than

<

nothing

(Round to one decimal place asneeded.)

c. Compare the results. Does the treatment with magnets appear to beeffective?

A.

Since the confidence intervalsnbsp do not nbsp

donotoverlap, it appears that the magnet treatments are less

less effective than the sham treatments.

B.

Since the confidence intervalsnbsp

overlap, it appears that the magnet treatments are more

more effective than the sham treatments.

C.

Since the confidence intervalsnbsp

overlap, it appears that the magnet treatments are no more

nomore effective than the sham treatments.

D.

Since the confidence intervalsnbsp do not nbsp

donotoverlap, it appears that the magnet treatments are more

more effective than the sham treatments.