Estion 4 (May/June 2016 P1) Research shows that the average age of first menstruation is influenced by
socio-economic status as well as race.
Scientists carried out an investigation to determine the average age of the first
menstruation of the girls in a community
Their hypothesis was
The average age of first menstruation has decreased over time.
2.5.1 For the investigation state the
(a) Independent variable
(b) Dependent variable
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