A certain drug is used to treat asthma. In a clinical trial of the drug, 22 of 276 treated subjects experienced headaches (based on data from the manufacturer). The accompanying calculator display...

Extracted text: A certain drug is used to treat asthma. In a clinical trial of the drug, 22 of 276 treated subjects experienced headaches (based on data from the manufacturer). The accompanying calculator display shows results from a test of the claim that less than 9% of treated subjects experienced headaches. Use the normal distribution as an approximation to the binomial distribution and assume a 0.05 significance level to complete parts (a) through (e) below. b. What is the test statistic? Z= A (Round to two decimal places as needed.)