1 of 8 0-day streak

Describe association between two categorical variables

Question 1 of 8

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A cafe recorded drink choices made by customers on different visit days

The groups are Weekday visitors and Saturday visitors

The group sizes are Weekday visitors: 200 and Saturday visitors: 400

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

Drink choice	Weekday visitors	Saturday visitors
Tea	12%	19%
Coffee	59%	49%
Water	12%	13.5%
Another drink	17%	18.5%

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

(a)2 marks

What percentages are recorded for the "Coffee" category in Weekday visitors and Saturday visitors?

Weekday visitors: Coffee (%) Saturday visitors: Coffee (%)

(b)1 mark

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

Comparing every response category across all groups, the largest displayed gap is 10.0 percentage points. For "Coffee", Weekday visitors has 59.0% and Saturday visitors has 49.0%. The displayed conditional profiles differ. This descriptive sample comparison alone establishes neither a population association nor causation

Using all 600 cases as the denominator gives 19.7% for the "Coffee" category in the Weekday visitors group and 32.7% in the Saturday visitors group. These figures show evidence of association in this sample

There were 196 responses in the "Coffee" category for the Saturday visitors group and 118 for the Weekday visitors group. The larger count shows that the groups are associated in this sample