Researchers conducted a study to determine whether magnets are effectiveinteatin

Question

Researchers conducted a study to determine whether magnets are effectiveinteating back pain The results are shown inte table forte teatment twth magnets)group and the sham (or placebo) The results are a measure reduction in back pain Assume that two samples are independent simple random samples selected from normally distributed and do not that the population standard are equal complete parts (a) and (b) below, a. Use a 005 significance level and test the claim that those treated with magnets have agreater reduction in pain than those given a treatment mean sham What are the and ahemative hypotheses The test statistic, is Round two decima places as needed) The P-value is Round three decimal places as needed State the conclusion for the test the rul hypothesis There sufficient evidence to suppon the claim that those treatedwin magnets have a greater mean reducton in pain tantose gvena sham teanment. Is it vaid to argue that magnets might appear 1o be enectve ifthe sample sizes are larger? mean for those given a sham treatment valdtoargue ear magnets might appear to be enectverme the sample for those treated with magnets sample sizes are b, construct a confidence interval surable for testing ehedaim that eose treated magnets have a gr than those given a sham teatment Round no three decima places as needed) cick to select your answertsl

Explanation / Answer

here a) option B is correct

degree of ffreedom =((s12/n1+s22/n2)2/'(s12/n1)2/(n1-1)+(s22/n2)2/(n2-1))=41

and std error =(s12/n1+s22/n2)1/2=0.3171

hence test stat t=(X1-X2)/std error =0.35

p vlaue =0.365

do not reject...there is not sufficient..

S1 0.990 S2 1.110 n1 22 n2 22 X1 0.490 X2 0.380

Related Questions

Navigate

• Browse (All)
• Browse R
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.