Hypothesis and Variables

Independent variable:
Length of the foot

Dependent variable:
Length of the forearm

Rationalization of choice of variables:
Refer to Literature Review

Conceptualization:
The length of the forearm is defined as the distance between the elbow crease and the distal wrist crease in centimeters. 
The length of the foot is defined as the distance between the calcaneus and the tip of the longest toe (1st/2nd/3rd phalanx) in centimeters.

Operationalization:
The independent and dependent variables are measured using a standardized measuring tape, ruler and shoe box to prevent parallax errors.

Extraneous variables:
  • Gender
  • Age
  • Race
  • Religion
  • Weather / surrounding temperature (lengths of forearm and feet may change in size due to expansion / contraction)
  • Degree of supination of forearm (may affect measurement of forearm length in supinated position)
  • Length of toe nails (may interfere with measurement of actual foot length)
  • Medical condition (Pes planus, edema)

Research hypothesis:
There is a positive relationship between the length of the forearm and the length of the foot.

Null hypothesis:
There is no relationship between the length of the forearm and the length of the foot.