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2.2 Data Presentation and Interpretation

2.2 Data Presentation and Interpretation

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Question 27

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

2.2 Data Presentation and Interpretation Questions

  1. A Level
  2. /Maths
  3. /2.2 Data Presentation and Interpretation

121 exam-style questions on OCR A Level Maths 2.2 Data Presentation and Interpretation, covering 2.2.1 Tables and diagrams for single variable data, 2.2.2 Area in a histogram, 2.2.3 Scatter diagrams and regression lines, 2.2.4 Informal interpretation of correlation, 2.2.5 Correlation and causation, 2.2.6 Measures of average and spread, 2.2.7 Calculations of mean and standard deviation, 2.2.8 Outliers, 2.2.9 Selecting or critiquing data presentation, and 2.2.10 Cleaning data. Each one has a worked solution and a mark scheme showing where the marks go.

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