A pharmaceutical company wants to test whether Aspirin 1 is

A pharmaceutical company wants to test whether Aspirin 1 is as effective as Aspirin 2. A random sample of 400 people with headaches are given Aspirin 1 and 260 report they feel better within 1 hour. Another independent random sample of 350 people with headaches are given Aspirin 2 and 220 report they feel better within 1 hour. a) At the 1% level of significance, does there appear to be a difference in the effectiveness of the 2 types of Aspirin? b) What is the p-value?

Solution

Relative improvement conversion rate variant (B) over control (A): -3.3%

Test result is not significant at 95% significance level (1-sided). p-value = 27%