# Confidence interval for relative risk

Researchers randomly assigned 1000 hospitalized patients older than 50 to receive either 40mg of Med A per day, 20 mg of Med A per day or placebo to prevent venous embolism.

See attached.

1. State the null and alternative hypothesis of each test reported in the table above.

2. Are the p-value of each of the test reported in the table above less than 5%? Justify your answers.

3. Interpret the 1.02(0/07-1.51) appearing under 20 mg of Med A. Your interpretation must contain the three "values", i.e. 1.02, .7, 1.51.

4. Interpret the 0.37(0.22-0.63) appearing under 40 mg of Med A. Your interpretation must contain the three "values", i.e. 0.37, 0.22, and 0.63.

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#### Solution Preview

See the attached file.

1. Null hypothesis: the relative risk under 20 mg of Med A is equal to 1

Alternative hypothesis: the relative risk under 20 mg of Med A is not equal to 1

Null hypothesis: the relative risk under 40 ...

#### Solution Summary

The solution provides explanations how to interpret the confidence interval for relative risk. The null and alternative hypothesis of each test is reported.