a)

Using the data in Table 1, plot a graph of body mass against the oxygen uptake for the 15 subjects. The independent (x-variable) is body mass.

Draw a line of best fit and extrapolate the line to the y-axis. Attach your completed ‘hand-drawn’ graph to your Graphing Exercise.

(6 marks)

Attached

b)

Calculate the gradient of the graph, showing your working. On your graph, show the coordinates that you selected for calculating the gradient, together with the rise and run lines. However, do not show the full working for the gradient on your graph – it must be provided separately. Include the correct unit for the gradient.

(2 marks)

c)

Provide the ‘equation of the line’ for your graph, and explain what each component of the equation represents.

(1 mark)

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MLS101 Graphing Exercise (Task 1b) 2015

d)

What do the research findings obtained by the clinical scientist suggest?

In your answer, describe the relationship between the two variables.

(1 mark)

Answer:

This research suggests a directly proportional relationship between the weight of the subject and their energy usage.

Oxygen usage increases by the same amount for every kg added.

e)

Using your ‘equation of the line’ (not the graph), determine the oxygen uptake for a normal healthy adult with a body mass of 65 kg. Show your working. The answer must be to one decimal place.

(1 mark)

f)

A standard size chocolate bar has an energy value of 1100 kJ (where kJ is kilojoules). How many minutes of brisk walking will a normal healthy adult with a body mass of 65 kg have to undertake to expend the same amount of energy as the standard…