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19 Cards in this Set
- Front
- Back
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How would you choose a suitable interval? |
A suitable interval gives a measurable change between readings that would allow a pattern to be seen. |
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Give 3 ways in which you can ensure valid results |
•Make sure you are actually measuring what you intend to measure •Keep all other variables constant to ensure a fair test •Make sure results are repeatable |
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Why might you decide to take more readings? |
•to change the interval between readings to increase confidence in line of best fit •to extend the range to increase the max & min values •allow a mean to be calculated & reduce the effect of errors |
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What is a control variable? |
A factor which is kept constant during an experiment. The independent variable is not changed in control. |
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What is the range of an experiment? |
The min & max values of an experiment. |
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What name is given to the standard procedure to minimise the effect of hazards of an experiment? |
risk assessment |
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What is a fair test? |
The independent variable is the only thing that affects the dependent variable because all other variables are kept constantz |
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Why would another person get a different result when repeating your investigation? |
•different independent variable •different method •different control variables |
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Difference between dependent and independent variable |
"I" change the independent variable. You measure the dependent which "depends" on the changed variable |
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How to make an experiment with many variables valid |
Change only one variable, keep others constant |
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What is a reproducible set of results? |
Same results, different person carrying out the same method |
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What is a repeatable experiment? |
Same results, same method & equipment |
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What is a variable? |
A factor that can be changed/kept constant. Usually have a quantity that can be measured |
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How could you judge when the end point of an experiment has been reached? |
•Keep a reference sample to compare your results with •agree a physical end point - when you are so tired you can no longer continue to make a valid comparison |
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How to construct a results table? |
First column, X axis: independent variable
2nd column, y axis: dependent variable |
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Best way to deal with anomalous results? |
Reject anomalous results, repeat results until they are consistent |
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How do you know if a range is suitable? |
A suitable range would allow a pattern to be seen between results |
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What is the gap between each value called? |
The interval |
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What is an anomalous result? |
A result clearly not in line with other readings, doesn't fit the pattern |
