In question 3 and 4 the residual diagnostics can be checked using graphical analysis (since we did not cover the tests yet). However, you may use the tests as well if you wish. The slightly modified version of the homework is attavhed on March 1, at 3:00 pm.
Every homework is 40 points. Since there 7 homeworks, the maximum is 280 points.
But you will get the full credit for the total of homeworks 1-7 if you have 250 points (equivalent to 25% of the course grade). However, if you have more than that you will still receive up to 30 extra points (3% of the course grade). All the points will taken into account, including decimals and not rounded to integers.