Question

PART 3 - Create a confidence interval for a proportion.  
Drug Trial Data - Investigate the proportion of married patients.
Quality Control Data - Investigate the proportion of chips chosen while Kelly was managing the factory.
Employee Evaluation Data - Investigate the proportion of employees in the north region.

3a. Write a reason why you would want to estimate this population proportion.
3b. State the sample size, n, and the sample proportion, "p bar" (p with a line over it).
3c. Calculate a 95% confidence interval for the population proportion, p. Report at least three decimal places.
3d. Interpret this interval in the same way you did in step 2d.

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Answer 1

The following is the given informaiton :

	Present head ache	Not present head ache	Total
Treatment Group	29	2081	2110
Control Group	27	1584	1611

Relative risk = (29/2110)/(27/1611) = 0.82

Odds ratio = (29/2081)/(27/1584) = 0.8176

The RR value is less than one, there is decreased risk for headache for treatment group