Data analysis. Presenting data
Answers are for parents and teachers.
1
Build the variation series for the sample 2, 4, 4, 1, 2, 4, 3, 2, 4, 3.
1, 2, 2, 2, 3, 3, 4, 4, 4, 4
2
Find the frequency of 4 in that sample.
4
3
Find the relative frequency of 2 in that sample.
3/10
4
Relative frequencies: 0.1, 0.3, 0.25, ? Find the missing value.
0.35
5
Why must a sample be chosen at random?
Otherwise the sample does not represent the whole population and the conclusion may be wrong.