Which of the following is an example of negative correlation? a. People who spend more time exercising tend to weigh less. b. Teenage females tend to have fewer speeding tickets than teenage males. c. Students with lower IQ scores tend to have lower grades. d. As hours studying for a test decrease, so do grades on that test. e. Students’ shoe sizes are not related to their grades.

a. People who spend more time exercising tend to weigh less.          

Explanation:

In psychology, there are two different types of correlation exists including a negative and a positive correlation.

A negative correlation is described as a relationship that generally exists between two different variables whereby one variable increases and the other variable tends to decrease, and vice-versa. A perfect 'negative correlation' is signified by the value of '-1'.

answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.