Question

1. What is evidence-based medicine? 2. What are levels of measurement? 3. What is the difference between descriptive and inferential epidemiology? 4. Distinguish between descriptive and inferential statistics? 5. What are confidence intervals? How are they used in epidemiology? 6. What is a two-sample t-test? How is this test used in statistics and epidemiology?

Answer 1

1. This is a kind of approach by health proffessionals to prove effect of some act.which is useful in clinics or in research.

2. Nominal ,ordinal,interval or ratio.

3. Descriptive method : in this method numerical calculations or tables or graphs are used to provide informations about the population.

Inferential epidemiology : in this method we choose a small portion of the total population for study purpose.

4.we can distinguish descriptive statistics in which numerical tables,graphs and calculations are available but in inferential method inferences and predictions are based on sample of data.

5. It is  the possible range around the estimate.it provides upper and lower limit of the sample mean value,for example we choose 40 men for height and calculate mean value of them.so we can predict the limits.

6. it is a kind of test to test difference between 2 population means.2 sample t -test used when the population variances are equal or unequal and with large or small samples.