Exercise 6,8,9 stats wk1

Exercise 6 1. What are the frequency and percentage of the COPD patients in the severe airflow limitation group who are employed in the Eckerblad et al. (2014) study? Frequency = 7 Percentage = 14% 2. What percentage of the total sample is retired? What percentage of the total sample is on sick leave? Percentage of retired = Number of retired*100 / Sample size = (sample size - 14) *100 / sample size = 77*100 / 91 = 84.61% Percentage of sick leave = Number of sick leave*100 / Sample size = 24*100 / sample size = 24*100 / 91 = 26.37% 3. What is the total sample size of this study? What frequency and percentage of the total sample were still employed? Show your calculations and round your answer to the nearest whole percent. Sample size = 42+49 = 91 frequency of still employed = 14 percentage of the total sample were still employed = 14*100/91 = 15.38% ~ 15% 4What is the total percentage of the sample with a smoking history—either still smoking or former smokers? Is the smoking history for study participants clinically important? Provide a rationale for your answer. Percentage of the sample with a smoking history = Number of employees with smoking history*100 / 91 = (13+28+12+35) *100 / 91 = 96.7% Yes, the smoking history for study participants clinically important because a large percentage has a smoking history... 5. What are pack years of smoking? Is there a significant difference between the moderate and severe airflow limitation groups regarding pack years of smoking? Provide a rationale for your answer.