4. (2S points) In a study on some docions encourage a wait and see apprec wherea

Question

4. (2S points) In a study on some docions encourage a wait and see apprec whereas others treat right away wi antibiotics Those dectors advecating for the "wait and see approach claim that infections tend to clear up on their own within 1-2 weeks without eatment and do not want to contribate to the problem of overuse ef antibioties which can create resistance Other doctoes; however, are mone concemed about the megative side effects of an untreated infoction and will peescribe an antibiotic right away foe an infectio In a stady. rescanchers wanted to comipare the"w see" approach to the antibiote approach in 90 adalts with a bilateral ear infection In this dotors prescribed anlibiotic drop krone ofthe cars and a"wat and ser-approach furthe other ear. Afer 2 weeks, each ear was assessed to see if the infection was cured. The resalts ane presenited below Tes the 0.05 level whether there is an association between treatment(wai teeament ofbilateral car infections m otherwise healty adds. State the sigpificance level Drep W hich Nest seems ost appropriane? Be as speciflic as possiblie What is the oriical value Show Escel function wed b Label and describe the parameters involved e Stane the hypotheses i. Compute the appropriate odds ratio and 95% confidence interval for the odds ratio. Interpret the confidence interval. i. Odds ratio iConfidence interval What do you conclude based on the odds ratio confidence interval?

Explanation / Answer

1) chi-square - test of independence

as we want to test the association

3) HO : there is no association

Ha: there is association

4) significance level = 0.05

5) Test statistic = 25.38646

6) critical value = 3.84

7)p-value = 4.69 *10^(-7)

1- CHISQ.DIST(25.38646,1,1)

8)since p-value < 0.05

we reject the null and conclude that

there is significant evidence that there is association

Please rate my solution

c1 c2 total r1 51 19 70 r2 2 18 20 total 53 37 90 Oi 51 19 2 18 Ei 41.22222 28.77778 11.77778 8.222222 sum (O--Ei)^2/Ei 2.319257 3.322179 8.1174 11.62763 25.38646 critical value 3.84

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