Statisti| Homework: HW #31-Section 9-4 Two Dependent Samples (Mat I Score: 0 of

Question

Statisti| Homework: HW #31-Section 9-4 Two Dependent Samples (Mat I Score: 0 of 1 pt Hw score: 34 52%.311 or g pts 10-6) 8019(4 complete) e Home 9,4.19-T Question Help * A study was conducted to measure the effectiveness of hypnotism in reducing pain. The messurements are centimeters on a pain scale before and sterp Assume that the paired sample data are nm e random samples and that the iference, has a distribution that is approer ar r ma stu ta 95% confidence interval for the mean of the "before- ater" difierences Does hypnotism appear to be affactive in reducing pain? 12 1 8.4 9.0 6.8 7.3 3.4 23 a 24 work 7.6 6.5 10.5 73 7.3 6.5 2.8 Bafore After erpoint Lecture Construct a 95% confidence interval for the mean ol the hefore-after/ dmencas. (h"Round to two decrmal places as needed) hing Calc Noies m/Quiz Solutions debook tCrunch is for Success timedia Library rchase o urse Tools Opucns Enter your answer n the edit fleids andi theh cick check Answer

Explanation / Answer

Solution:-
Difference = before - after

Difference = 1.1,3.7,3.2,-0.8,3.7,2.2,4.3,-0.1

xd = 2.1625 , d = 1.9048

n = 8 , df = n-1 = 8-1 = 7

t = 2.365

95% confidence interval for the mean of the "before - after"

=> x +/- t*s/sqrt(n)
= 2.1625 +/- 2.365*1.9048/sqrt(12)
= 0.86 , 3.46

=>   0.86 < d < 3.46

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