Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.

Britannica Beyond We’ve created a new place where questions are at the center of learning.

100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.

COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.

Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.

Demystified Videos In Demystified, Britannica has all the answers to your burning questions.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives.A test score could have high reliability and be valid for one purpose, but not for another purpose. Reliability is a very important piece of validity evidence. An example of negative correlation would be height above sea level and temperature. What does reliability mean and why is it important Reliability refers to the degree to which scores from a particular test are consistent from one use of the test to the next. A negative correlation is a relationship between two variables in which an increase in one variable is associated with a decrease in the other. Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions. An example of positive correlation would be height and weight.Its degree of reliability has to do instead with the predictability of its relationship with whatever is being tested. It might always register three degrees too high, for example. Note, however, that the thermometer does not have to be accurate in order to be reliable. A thermometer that lacks reliability would change even when the temperature does not. If the temperature in a room stays the same, a reliable thermometer will always give the same reading.

Imagine that you’re trying to assess the reliability of a thermometer in your home.

Four methods sociologists can use to assess reliability are the test-retest procedure, the alternate forms procedure, the split-halves procedure, and the internal consistency procedure.

Good measurement instruments should have both high reliability and high accuracy.

If a measurement instrument provides similar results each time it is used (assuming that whatever is being measured stays the same over time), it is said to have high reliability.

Definition of reliability in psychology