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Cambridge IGCSE Statistics practice

Paper 1 structured question: Bivariate distributions

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Bivariate distributions

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Paper 1Statistical Techniques2 marks

A line of best fit for data relating temperature (x °C) and ice cream sales (y units) is given by y = -2x + 50.

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Line of Best Fit for Temperature and Ice Cream Sales

The equation of the line of best fit is y = -2x + 50, where x is temperature in °C and y is ice cream sales in units.

x (temperature °C)y (sales units)
1030
1520
2010
250
  1. a

    Calculate Estimate the ice cream sales when the temperature is 12°C.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 1 structured question: Bivariate distributions

Paper 1Statistical Techniques2 marks

Description

Line of Best Fit for Study Hours and Test Scores

The equation of the line of best fit is y = 5x + 40, where x is hours studied and y is the test score.

x (hours studied)y (test score)
040
250
460
670
880
  1. a

    Calculate Estimate the test score for a student who studies for 7 hours.

    Aim for approximately 2 distinct marking points.

    [2]