1 of 8 0-day streak

Compare categorical groups using two-way tables

Question 1 of 8

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A workplace survey records whether staff usually bring lunch. Group A works day shifts; Group B works evening shifts. Yes means "Bring lunch"; No means "Other lunch". 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	36	24	60
B	90	10	100

(a)1 mark

How many records from both groups have the response "Bring lunch"?

Combined count

(b)1 mark

What percentage of Group A has the response "Bring lunch"?

Group A percentage (%)

What percentage of Group B has the same response "Bring lunch"?

Group B percentage (%)

(d)1 mark

Which conclusion is justified by the displayed sample?

The first response is 60% in Group A and 90% in Group B. Its share is higher in Group B in this sample; this alone does not establish a population relationship or cause

Each within-group share should use the grand total 160 as its denominator

The raw counts 36 and 90 alone settle which group has the greater response share, without considering either group total

Group membership has been proved to cause the response pattern