A psychologist believes that

personality factors such as ability to get along with other people in a team

are likely to have an influence their success in a team sport. To investigate

this, she draws a sample of participants in competitive sport, comprising

soccer players, hockey players and cricketers from various sports clubs.  After evaluating their performance on an

appropriate psychometric test, she divides players from the three types of

sports into two groups: those who have good social skills and those who tend

avoid social contact.  She then uses

evaluation forms, based on interviews with different sports experts, to assess

the actual sports performance of the members of the sample.  The dependent variable in the study is - - -

- - and the independent variable is - - - - -.