Question

8. There is a statistically significant difference in height between twin boys and girls. True or false? (1 point) Use the following information to answer questions 9-11 A randomized controlled trial is conducted to compare an experimental medication to placebo to reduce the symptoms of asthma. 400 participants are enrolled in the study and randomized to receive either the experimental medication or placebo. The primary outcome is self-reported reduction of symptoms. Among 210 participants who receive the experimental medication, 85 report a reduction of symptoms. In contrast, 12 participants of the placebo group reported a reduction in symptoms. Hint: set up a 2x2 table 9. What is the risk of symptom reduction in persons taking the experimental medication? (1 point) a. 0.52 b. 0.60 c. 0.06 d. 0.97 e. 0.40 10. What is the 95% confidence interval for the risk of symptom reduction in persons taking the experimental medication? Round your answer to two decimal places (Hint: think of how you calculate risk - is it a mean or a proportion?) (2 points) a. (0.33, 0.47) b. (0.96, 0.98) с. (0.26, 0.42) d. (0.89, 1.05) e. (0.20, 0.38)

Answer 1

9)

risk of symtom reduction =85/210 =0.40

option E is correct

10)

std error       =Se		=√(p*(1-p)/n) =		0.0338
for 95 % CI value of z=				1.960
margin of error E=z*std error                            =				0.066
lower confidence bound=sample proportion-margin of error				0.334
Upper confidence bound=sample proportion+margin of error				0.466

option A is correct