A certain drug is used to treat asthma. In a clinical trial of the drug, 15 of 280 treated subjects experienced headaches (based

Question

A certain drug is used to treat asthma. In a clinical trial of the drug, 15 of 280 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 11% of treated subjects
experienced headaches. Use the normal distribution as an approximation to the binomial distribution and assume a 0.01 significance level
to complete parts (a) through (e) below.
Left-tailed test
Right tailed test
b. What is the test statistic?
Z= -3.02
(Round to two decimal places as needed.)
c. What is the P-value?
P-value=

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