![]() Or imagine a clinical psychologist who is interested in how depressed a person is. The length of the longest list for which the person responds correctly is the score and represents their working memory capacity. She then repeats this several times, increasing the length of the list by one digit each time, until the person makes an error. To do this, she might use a backward digit span task, in which she reads a list of two digits to the person and asks them to repeat them in reverse order. (Psychological measurement is often referred to as psychometrics.) Imagine, for example, that a cognitive psychologist wants to measure a person’s working memory capacity-their ability to hold in mind and think about several pieces of information all at the same time. This general definition of measurement is consistent with measurement in psychology too. The result of this procedure is a score that represents the object’s potential energy. In physics, for example, one might measure the potential energy of an object in Earth’s gravitational field by finding its mass and height (which of course requires measuring those variables) and then multiplying them together along with the gravitational acceleration of Earth (9.8 m/s2). It is also consistent with measurement in the other sciences. This very general definition is consistent with the kinds of measurement that everyone is familiar with-for example, weighing oneself by stepping onto a bathroom scale, or checking the internal temperature of a roasting turkey using a meat thermometer. Measurement is the assignment of scores to individuals so that the scores represent some characteristic of the individuals. Distinguish the four levels of measurement, give examples of each, and explain why this distinction is important.Distinguish conceptual from operational definitions, give examples of each, and create simple operational definitions.Explain what a psychological construct is and give several examples.Define measurement and give several examples of measurement in psychology. ![]()
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