Science:Math Exam Resources/Courses/MATH102/December 2015/Question 05
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Question 05 

Which of the following lines provides the best fit to the data in the least squares sense? 
Make sure you understand the problem fully: What is the question asking you to do? Are there specific conditions or constraints that you should take note of? How will you know if your answer is correct from your work only? Can you rephrase the question in your own words in a way that makes sense to you? 
If you are stuck, check the hint below. Consider it for a while. Does it give you a new idea on how to approach the problem? If so, try it! 
Hint 

You can probably identify the line that best fits the data just by looking, but it is better to justify your intuition with a calculation. 
Checking a solution serves two purposes: helping you if, after having used the hint, you still are stuck on the problem; or if you have solved the problem and would like to check your work.

Solution 

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Please rate my easiness! It's quick and helps everyone guide their studies. You can probably identify the line that best fits the data just by looking, but it is better to justify your intuition with a calculation. The smallest of these numbers, 3.75, is achieved by (b). answer: 