1 of 8 0-day streak

Compare categorical groups using two-way tables

Question 1 of 8

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A library survey records whether visitors prefer a digital receipt. Group A visits in the morning; Group B visits in the afternoon. Yes means "Digital receipt"; No means "Paper receipt". The displayed counts are synthetic teaching data. Each included record belongs to one of two groups and exactly one of the two response categories

Group	Yes	No	Total
A	20	20	40
B	56	84	140

(a)1 mark

How many records from both groups have the response "Digital receipt"?

Combined count

(b)1 mark

What percentage of Group A has the response "Digital receipt"?

Group A percentage (%)

What percentage of Group B has the same response "Digital receipt"?

Group B percentage (%)

(d)1 mark

Which conclusion is justified by the displayed sample?

The first response is 50% in Group A and 40% in Group B. Its share is higher in Group A in this sample; this alone does not establish a population relationship or cause

Group membership has been proved to cause the response pattern

The raw counts 20 and 56 alone settle which group has the greater response share, without considering either group total

Each within-group share should use the grand total 180 as its denominator