Logarithms, uncertainty and evaluation question

Key points to look for in an evaluation questions:

• sample size

• repeats

• control experiment

• control variables

• bias

• duration of the experiment

General points to look for in an evaluation question

• always state the overall trend 

• is there any overlap in data 

• is the test group result different from the control group 

• is there a statistic, if so what does it show 

What does evaluate the conclusion mean?

• consider both the method and data to come to a judgement

• Use all the information, which sometimes spread across sub section of question

Why are logarithms used?

used to help compare values that have a large range

What are the units for Logs

• logarithms themselves have no units

• but you should indicate what the original units were

How do you measure uncertainty?

uncertainty = ± half the smallest division on the scale.

How do you measure percentage uncertainty?

Percentage uncertainty=(uncertainty/measured value ​)×100