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A certain drug is used to treat asthma. In a clinical trial of the drug, 20...

A certain drug is used to treat asthma. In a clinical trial of the drug, 20 of 265 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 approximate to the binomial distribution and assume a 0.05 significance level to complete parts (a) through (e) below.

a. Is the test two-tailed, left-tailed or right-tailed?

b. What is the test statistic?

c. What is the P-value?

d. What is the null hypothesis, and what do you conclude about it?

Identify the null hypothesis

Decide whether to reject the null hypothesis. Choose the correct answer below.

e. What is the final conclusion?

Math   Statistics-And-Probability   
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