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

16

of

256

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

10%

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.

1-PropZTest
	prop<0.1
	z=2.000000000
	p=0.0227501319
	p=0.0625000000
	n=256

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

Two-tailed test

Right tailed test

Left-tailed test

b. What is the test statistic?

z=enter your response here

(Round to two decimal places as needed.)

c. What is the P-value?

P-value=enter your response here

(Round to four decimal places as needed.)

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

Identify the null hypothesis.

A.

H0:p<0.1

B.

H0:p>0.1

C.

H0:p0.1

D.