A certain drug is used to treat asthma. In a clinical trial of the drug, 19 out of 275 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.
TI-84 Prop 0.09 Z = -1.211600787 P = 0.1128326792 P = 0.0690909091 n = 275
Is the test two-tailed, left-tailed, or right-tailed?
What is the test statistic?
What is the P-value?
What is the null hypothesis, and what do you conclude about it?
What is the final conclusion?