Biostatistics

What is the formula for simple linear regression?

• A. y = a + bx

• B. y = ax + b

• C. x = a + by

• D. x = ay + b

What is regression?

• A. A measure of central tendency

• B. A measure of spread

• C. A measure of the strength of a relationship between two variables

• D. A statistical method for predicting a variable based on another variable

What is the formula for calculating the correlation coefficient?

• A. Σxy / Σx

• B. Σx / Σy

• C. Σx² / Σy²

• D. Σxy / √(Σx² Σy²)

What is the range of the correlation coefficient?

• A. 0 to 1

• B. -1 to 1

• C. -∞ to ∞

• D. 0 to ∞

What is correlation?

• A. A measure of central tendency

• B. A measure of spread

• C. A measure of the strength of a relationship between two variables

• D. A measure of variability

What is the formula for calculating the interquartile range?

• A. Third quartile - First quartile

• B. Second quartile - First quartile

• C. Third quartile - Second quartile

• D. Fourth quartile - Third quartile

What is the formula for calculating the coefficient of variation?

• A. Standard deviation / Mean

• B. Variance / Mean

• C. Mean / Standard deviation

• D. Mean / Variance

What is the formula for calculating the variance of a dataset?

• A. (Highest value + Lowest value) / 2

• B. Sum of all values / Number of values

• C. Sum of squares of deviations from mean / Number of values

• D. Value that occurs most frequently in a dataset

What does a correlation coefficient of 0 indicate?

• A. There is a strong positive relationship

• B. There is a strong negative relationship

• C. There is no relationship

• D. The variables are not related

What is the formula for calculating the standard deviation of a dataset?

• A. (Highest value + Lowest value) / 2

• B. Sum of all values / Number of values

• C. Square root of variance

• D. Value that occurs most frequently in a dataset