1 of 8 0-day streak

Describe association between two categorical variables

Question 1 of 8

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A market survey recorded the first item bought at different shopping times

The groups are Before 9 am and 9 am to midday

The group sizes are Before 9 am: 200 and 9 am to midday: 400

Percentages are shown to 1 decimal place. Each column gives percentages within one group

First item bought	Before 9 am	9 am to midday
Fruit	5.5%	11%
Vegetables	78.5%	66.5%
Bread	7%	11.5%
Another item	9%	11%

Describe the displayed conditional distributions across all response categories. Use the displayed precision; no statistical significance test is requested

(a)2 marks

Read the percentage for the "Vegetables" category in Before 9 am and in 9 am to midday

Before 9 am: Vegetables (%) 9 am to midday: Vegetables (%)

(b)1 mark

Which report correctly compares the whole conditional distributions and limits its conclusion?

Being in the Before 9 am group rather than the 9 am to midday group caused the percentage of responses in the "Vegetables" category to differ

Comparing every response category across all groups, the largest displayed gap is 12.0 percentage points. For "Vegetables", Before 9 am has 78.5% and 9 am to midday has 66.5%. The displayed conditional profiles differ. This descriptive sample comparison alone establishes neither a population association nor causation

The percentage for the "Vegetables" category in the Before 9 am group was 78.5%, while the percentage for the "Fruit" category in the 9 am to midday group was 11%. These different percentages show evidence of association in this sample