In a positive correlation, as one variable increases, so does the other variable, and as the first decreases, so does the second. A negative correlation is the opposite. As one variable increases, the other variable decr... More »

Differences between Gram positive and Gram negative bacteria include the thickness of the cell wall, which is approximately 20 to 30 nanometers thick in Gram positive and 8 to 12 nanometers thick in Gram negative; the am... More »

Negative reinforcement seeks to promote a desirable behavior by removing an aversive stimulus while positive punishment seeks to stop an unwanted behavior by applying an aversive stimulus. In order to be effective, both ... More »

The strength of the correlation is determined by the correlation coefficient, r. It is sometimes referred to as the Pearson product moment correlation coefficient in honor of its discoverer, Karl Pearson, who first intro... More »

Cramer's V is a chi-square based method of determining correlation in tables with more than 2x2 rows and columns, according to ChangingMinds.org. It is used to determine the strength of a correlation that has already bee... More »

The three main types of correlation are positive, negative and no correlation. A positive correlation means that both variables increase together. A negative correlation means that as one variable increases, the other de... More »

An example of a negative correlation in practical terms is that as a chicken gets older, they tend to lay fewer eggs. This is a negative correlation because as the years of the chicken increase, the number of eggs decrea... More »