This response indicates application of a reasonable strategy that leads to a correct solution within the context of the problem. The student gives a correct equation for the line of best fit (y=–4.46x+32.67). The date in April, if the average March temperature were 3.5°C, is correct (17 of April) and the explanation is well developed. The student replaces x in the equation with 3.5 and solves for y. The student states that it is inappropriate to use the equation if the average March temperature were 14°C and the justification is fully developed (the temp. of 14°C is way off the equation and also off the line of best fit so you would get a wrong answer if used. I got –29.77 which of course is wrong because there is no –29.77 day in April). This response demonstrates a complete understanding and analysis of the problem.
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