BCA QUIZ 2

Which of the following measures is unit-dependent?

• Correlation

• Covariance

• Mean

• Standard deviation

The equation of a simple linear regression is represented as:

• y=mx+c

• y=aX+bX^2

• y=ax^2+bx+c

• y=a+bX

In linear regression, the residual is:

• The slope of the regression line

• The predicted value

• The error between the actual and predicted values

• The intercept of the regression line

Which metric is used to evaluate the performance of a regression model?

• Mean Absolute Error (MAE)

• Root Mean Squared Error (RMSE)

• R-squared (R^2)

• All the above(a,b,c)

Multiple linear regression allows:

• a) Only one independent variable

• b) Multiple independent variables

• c) Only one dependent variable

• d) Both b and c

In a study of how exercise affects weight loss, the dependent variable is:

• a) Exercise

• b) Diet

• c) Weight Loss

• d) Both a and c

Which statement is true about dependent and independent variables?

• The dependent variable explains changes in the independent variable.

• The independent variable is affected by the dependent variable.

• The dependent variable depends on the independent variable.

• None of the above

In a scatterplot, the independent variable is typically plotted on the:

• X-axis

• Y-axis

• Both axes

• None of the above

Which assumption is required in linear regression?

• a) Normal distribution of residuals

• b) Homoscedasticity

• c) Linearity

• d) All of the above(a,b,c)

Multicollinearity in multiple regression occurs when:

• Independent variables are highly correlated with each other

• Independent variables are independent

• Dependent variables are highly correlated

• Residuals are heteroscedastic