medium · SAT Math
A typing instructor records, for 5 students, the number of weeks of practice (x, weeks) and typing speed (y, words per minute): Weeks practiced (x): 0 3 6 9 12 Typing speed (y, wpm): 27 40 48 61 69 The line of best fit is y = 3.5x + 28, where x is weeks of practice and y is predicted typing speed in words per minute.
Which choice best interprets the slope of this line of best fit in context?
- A student who has practiced for 3.5 weeks is predicted to type at 28 words per minute.
- Each additional week of practice is associated with a predicted increase of about 3.5 words per minute.
- Each additional week of practice is associated with a predicted decrease of about 3.5 words per minute.
- Each additional week of practice is associated with a predicted increase of about 28 words per minute.
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