1 Polyps: Benign growths in the uterine lining (endometrium) can cause a heavy or prolonged period. 2  Ovary dysfunction: Lack of ovulation (anovulation) results in a lack of progesterone, causing heavy periods. 3  Adenomyosis: When glands from the uterine lining embed in uterine muscle, heavy bleeding can occur.
Mean and Variance of Random Variables. The mean of a random variable provides the long-run average of the variable, or the expected average outcome over many observations.
Types of Variable. All experiments examine some kind of variable(s). A variable is not only something that we measure, but also something that we can manipulate and something we can control for.ependent and Independent Variables. An. variable, sometimes called an. or. variable, is a variable that is being manipulated in an experiment in order to observe the effect on a. variable, sometimes called an. variable.