course | course_year | question_number | tags | title | year | |||
---|---|---|---|---|---|---|---|---|
Statistics |
IB |
73 |
|
Paper 2, Section I, E |
2010 |
A washing powder manufacturer wants to determine the effectiveness of a television advertisement. Before the advertisement is shown, a pollster asks 100 randomly chosen people which of the three most popular washing powders, labelled
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&
Derive and carry out an appropriate test at the
[You may find the following table helpful:
$\left.\begin{array}{c|cccccc} & \chi_{1}^{2} & \chi_{2}^{2} & \chi_{3}^{2} & \chi_{4}^{2} & \chi_{5}^{2} & \chi_{6}^{2} \ \hline 95 \text { percentile } & 3.84 & 5.99 & 7.82 & 9.49 & 11.07 & 12.59\end{array} \cdot\right]$