Mathematics > QUESTION PAPER (QP) > Pearson Edexcel Level 3 GCE [Mathematics Advanced Subsidiary PAPER 21: Statistics] (All)

Pearson Edexcel Level 3 GCE [Mathematics Advanced Subsidiary PAPER 21: Statistics]

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1. The relationship between two variables p and t is modelled by the regression line with equation p = 22 – 1.1 t The model is based on observations of the independent variable, t, between 1 and ... 10 (a) Describe the correlation between p and t implied by this model. (1) Given that p is measured in centimetres and t is measured in days, (b) state the units of the gradient of the regression line. (1) Using the model, (c) calculate the change in p over a 3‑day period. (2) Tisam uses this model to estimate the value of p when t = 19 (d) Comment, giving a reason, on the reliability of this estimate. [Show More]

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