Correlation and Regression — MCQs

A group of 80 people is being studied to determine the effect of diet modification on cholesterol levels. To compare the mean cholesterol levels before and after the diet modification in this group, which statistical test should be used?

Which finding best predicts poor outcome in acute pancreatitis at admission?

A graph shows four different distribution curves labeled A, B, C, and D. Identify the correct sequence of distribution types shown in the graph.

Correlation between height and weight is measured by?

The best method to show the association between height and weight of children in a class is by:

What is the most important criterion in a causal relationship hypothesis?

The relationship between birth rate and maternal hemoglobin is best studied by:

What is the correlation coefficient if regression coefficient of X on Y is 0.8 and Y on X is 0.9?

To understand the relationship between weight and height of a group of school children, the data can graphically be best depicted through

Consider the following statements about correlation between two variables : 1. The correlation is done between an independent variable X and a dependent variable Y. 2. The coefficient of correlation can range from -1 to ∞. 3. If coefficient of correlation (r) is equal to 1, it indicates there is no association between X and Y. 4. Correlation does not necessarily prove causation. Which of the statements given above are correct ?