Decide if the following statements are true or false, please share the justifications.

iv) In the simple linear regression model there are 4 parameters to be estimated.

v) If in a simple linear regression model r = 0.35, then 35% of the variation of Y is explained by x.

vi) A simple linear regression model is fitted to data consisting of ten observations. Then it is possible to have 7 negative residuals less than -1 and 3 positive residuals less than 2.