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2 Statistics

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Question 223

A regression line of y y\,y on x x\,x is y=84−2.8xy=84-2.8xy=84−2.8x, based on 12≤x≤2812\leq x\leq2812≤x≤28.

a.

Find the value of x x\,x for which the predicted value of y y\,y is 35.

[2]
b.

State whether this use of the model is interpolation.

[1]
c.

Find the set of observed-range values of x x\,x for which the model predicts y>30y>30y>30.

[3]
Markscheme

2 Statistics Questions

  1. A Level
  2. /Maths
  3. /2 Statistics

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