A hypothesis that states that there is a lack of relationship between two factors is called: a. an experimental hypothesis. b. reverse psychology. c. superstition. d. a null hypothesis. e. correlation.

d) a null hypothesis

Explanation:

Null hypothesis simply means "NO DIFFERENCE".

It always predicts that there is no relationship between the variables being studied. The reasearcher wishes to disapprove this hhypothesis.

This hypothesis states that the observed difference is entirely due to the sampling error i-e it occured purely by chance.

For example : There is no relation between smoking and lung cancer..

risky behaviors. many behaviors are risky for your health and happiness. the main hazards include using tobacco, alcohol, and sexual activity.