The lecture Biostatistics and Epidemiology Question Set 2 by Lecturio USMLE is from the course Biostatistics and Epidemiology – USMLEStyle Questions.
A researcher was studying the association between haemoglobin value and BMI. He divided the students of a class into two groups based on their BMIs into normal weight group and overweight group. Then he measured the haemoglobin values of all the students. His null hypothesis was that there is no association between haemoglobin value and body weight. The mean haemoglobin value of the normal weight group was 13.4 gm/dl and that of the overweight group was 13.8 gm/dl. He obtained a mean difference of 0.4 gm/dl between the two groups. He did an unpaired t test and he got a p value of 0.10. What does this mean?
In a study to find out the association between smoking and bladder cancer, 100 adult males with bladder cancer were recruited to the study group. The control group consisted of 100 similar individuals without bladder cancer. Their history of smoking was obtained and the data was analysed. The calculated odds ratio was 2.7. What does this mean?
In a study for determining the risk factors of young age myocardial infarction (MI), 30 cases of young age MI were recruited to the study group. 60 suitable individuals were recruited to the control group. Educational status was considered as an important variable as it would affect the awareness about the disease and its risk factors. Education status data was taken qualitatively in four categories and then later recoded to two new categories, namely low education and high education. A chi square test was done to test the significance and the risk was also obtained as Odds ratio of 2.1 for the low education category with a confidence interval of 0.9 to 9.7. What inference do you make on the association between young age myocardial infarction and educational status with this study?
A researcher faced a task of calculating the mean height of the male students in a college having 2000 male students and 1750 female students. The mean height of the sample was obtained as 176 cm with a standard deviation of 7 cm. The researcher calculated a confidence interval for the mean height of the male students in that college. What more do you need to calculate the same?
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