In numbers 1-5, use the data in the table below on data about Pfizer, Inc. The table describes results from a clinical trial of the drug Viagra. Some subjects were treated with Viagra while others were given a placebo; then headache events were recorded. Headache No Headache Viagra Treatment 117 617 Placebo 29 696 1. Is the study retrospective or prospective? 2. Solve P(headache | Viagra Treatment). Round off to 3 decimal places. 3. Solve P(headache | placebo). Round off to 3 decimal places.
Solve the following problems about Risks and Odds.
In numbers 1-5, use the data in the table below on data about Pfizer, Inc. The table describes results from a clinical trial of the drug Viagra. Some subjects were treated with Viagra while others were given a placebo; then headache
| Headache | No Headache | |
| Viagra Treatment | 117 | 617 |
| Placebo | 29 | 696 |
1. Is the study retrospective or prospective?
2. Solve P(headache | Viagra Treatment). Round off to 3 decimal places.
3. Solve P(headache | placebo). Round off to 3 decimal places.
4. Find the number of Viagra users that would need to stop using Viagra in order to prevent a single headache. Round off to the nearest whole number.
5. Find the relative risk of a headache for those in the treatment group compared to those in the placebo group. Round off to 2 decimal places.
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