A botanist investigates the relationship between Y, the heights of seedlings (in

Question

A botanist investigates the relationship between Y, the heights of seedlings (in inches), and X, the number of weeks after planting. The fitted regression line for seedling height on the number of weeks after planting is: ? = -2.8 + 2.62X. If the number of weeks after planting ranged from 2 to 8, what is the predicted height for a seedling after 12 weeks? A botanist investigates the relationship between Y, the heights of seedlings (in inches), and X, the number of weeks after planting. The fitted regression line for seedling height on the number of weeks after planting is: ? = -2.8 + 2.62X. If the number of weeks after planting ranged from 2 to 8, what is the predicted height for a seedling after 6 weeks?

Explanation / Answer

1.

The sample is only for 2 to 8 weeks, so we cannot use it for 12 weeks.

hence,

OPTION C: Should not be determined. [ANSWER]

*****************

2.

As

y^ = -2.8 + 2.62x

Then if x = 6,

y^ = -2.8 + 2.62*6 = 12.92 [ANSWER, D]

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