Imagine we wanted to investigate whether the reason for quitting smoking affects success rate. We recruited a sample of 120 smokers. Half wanted to quit to improve their appearance (yellow teeth and bad breath, etc.), and half wanted to quit to improve their health (life expectancy, etc.). After six months we measured how successful they had been at quitting smoking. The data were skewed so we ran a Wilcoxon rank-sum test on the data (output below).
Which of the following sentences correctly reports the results from the Wilcoxon rank-sum test?
A. People who wanted to quit smoking to improve their health were significantly more successful at quitting than those who wanted to quit to improve their appearance, Ws = 3245.5, z = –2.04, p = .04.
B. People who wanted to quit smoking to improve their appearance were significantly more successful at quitting than those who wanted to quit to improve their health, T = –2.04, z = 188.57, p < .05.
C. This output relates to the Mann–Whitney test and tells us nothing about the Wilcoxon rank-sum test.
D. People who wanted to quit smoking to improve their appearance were significantly more successful at quitting than those who wanted to quit to improve their health, Ws = 3245.5, z = –2.04, p = .04.
Answer: D
You might also like to view...
Only low income families qualify for free early intervention services
Indicate whether the statement is true or false
Discuss two concerns that have been raised about the use of intelligence tests
What will be an ideal response?
Describe the eight key components that must be included in the IFSP?
What will be an ideal response?
According to Creswell (2005), qualitative researchers intentionally ______.
A. provide a detailed, written plan B. select specific individuals and sights C. investigate the quality of a given topic D. investigate many topics from different perspectives