There will be a positive correlation between an individual's foot length and their hand span. This may be due to linkage; the genes that create these characteristics may be positioned on the same chromosome so that they become linked, and are inherited together. This linkage causes the two characteristics to become associated so that a person with large feet will also have large hands.

In order to create a fair investigation, it was necessary to consider the variables that affect an individual's foot length or hand span. Any variables that were likely to disrupt the results were controlled and those measured were recorded accurately so that any correlation could be observed and evaluated successfully.

i) Age - The majority of individuals stop growing by the age of eighteen. Below this age, people grow at different rates and for this reason, cannot be compared accurately. In this investigation, the sample included only, people above the age of seventeen. Above this age, most people will have attained their maximum growth and therefore their maximum foot length and hand span.

The frequency distribution graphs have shown that males tend to have a larger hand span and foot length than females. This may be due to males generally being taller and therefore have greater sized bodies, feet and hands.

Some topics in this essay:
Standard Deviation, , Environmental Factors, Correlation Coefficient, Proportions Linkage, hand span, foot length, Length Results', Total Mean, hand span foot, span foot, span foot length, foot length hand, length hand, frequency distribution, length hand span, hand spans, correlation hand, distribution graph, frequency distribution graph, positive correlation, trend line, Male Female, Rank Correlation, Female Total,