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2.2 Data Presentation and Interpretation

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Question 34

For winter days, a regression line for daily energy cost, e e\,e pounds, on mean temperature, ttt °C, is e=7.3−0.4te=7.3-0.4te=7.3−0.4t.

a.

Describe the correlation indicated by the line.

[1]
b.

Interpret the gradient.

[1]
c.

Estimate the cost when t=5t=5t=5.

[1]
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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