Paper 2 Flashcards
Do your results support the hypothesis that you investigated?
Yes, my result supports my hypothesis. There is a positive correlation between height and lung volume.
As height increases, lung volume increases. For example, when height is (…), lung volume is (…). When height increases to (…), lung volume increases to (…)
Did you get any anomalous results?
Yes.
An anomalous result is a result that is a results that does not fit the patterns of other results.
According to the line of best fit, the candidate with height of (…) should have a lung volume estimated to be (…). However, the result of the experiment shows that the candidate with this height has a lung volume of (…)
All other results (apart from the other (…) anomalous results) are very close to the line of best fit. (Therefore, the result that is far from the line of best fit is an anomalous result. )
Describe in details how you could use repeated readings to obtain more accurate results.
Repeating readings allow the mean of the results to be calculated.
To calculate the mean, find the sum of all results obtained from repeated readings of lung volume of a certain candidate and divide this sum by the number of repeated readings.
Any anomalous results need to be discarded before calculating a mean.
What do you think was the cause of the largest error or uncertainty in your investigation? What could you do to reduce the size of this uncertainty if you were to repeat the investigation?
The cause of the largest error in my investigation is that gender isn’t a controlled variable. If I were to repeat the investigation, I will choose candidates of the same gender to reduce this error. This will ensure that the result of the investigation reflect only the effect of height, not gender, on lung volume.
What was the independent variable in the investigation that you did?
What was the range of the independent variable?
Explain why this was or was not a suitable range.
The height of the candidates.
State the smallest and largest numbers.
Most people’s heights are included in this range, which means that the result of the experiment will be relevant to the context and a pattern will be identified.
How could the results from your investigation be useful in the context you have researched?
The results from the investigation shows that a taller person might be better than a shorter person at playing a wind instrument because with bigger lung volume, they can take deeper breaths and hold longer notes. Therefore, it is useful for a teacher to decide whether a beginner should pick up a wind instrument depending on their height.
Other people trying to repeat your investigation might get results that are different from yours. Suggest and explain one reason why they might get different results.
They obtain different results because the measuring flask used in the experiment has a low resolution (0.5dm3). This means that it is easy to make measuring error as the true value is left to imagination.
Other people trying to repeat your investigation might get results that are different from yours. Suggest and explain one reason why they might get different results.
The results may be different due to human (e.g. parallax error) and random error (which changes the distribution of answers). Also, due to the low resolution of the measuring flask(0.5dm3), it is easier to make human error in measuring the amount of water displaced.
