The mean of a collection of data is located at the ______ of a distribution of data.

The sum of the differences between sample observations and the sample mean is equal to _______.

To locate the percentile for a given observation in a data set, the data must be ___________.

Two samples are ________________ if the sample values are paired.

In a curvilinear regression model, the ________ represents the curvilinear effect.

A(n) _______ distribution has a ""bell"" shape.

Operational definition is the definition of a concept by means of the operations or procedures that were used to _____ it.

In nominal scale the data is _____

Nocebo effect is the belief of a participant in an experiment or a patient that a drug or treatment will_____

Measurement error is the difference between an obtained value of the dependent variable and what would be the theoretically true value.

A measurement scale in which the units of measurement are equal along the length of the scale and rational zero point _____