The study of theories and technique of psychological measurement is called psychometrics.

These two classmates have posted their DQ response for the class an I have to respond to them both separately with a word count 150 for both each

Brianna Cardinal

1. According to Oxford (2019) statistcs are a collection of information or data “and analysing numerical data in large quantities, especially for the purpose of inferring proportions in a whole from those in a representative sample” (Oxford, 2019). Statistics show a large amount of research information at a glance, usually presented in chart or graph form.

The study of theories and technique of psychological measurement is called psychometrics. It “includes the measurement of knowledge, abilities, attitudes, and personality traits. The field is primarily concerned with the study of differences between individuals” (Benet, 2019).

Descriptive and Inferential Statistics are types of statistics. One describes the study group the other makes predictions based on historical info. “Descriptive statistics uses the data to provide descriptions of the population, either through numerical calculations or graphs or tables. Inferential statistics makes inferences and predictions about a population based on a sample ofdata taken from the population in question” (Study.com, 2019). Each uses collected info but views it differently.

There are 4 types of data:

Nominal uses categories and has no quantitative value. “Anordinal scale categorizes individual items and forms a rank as in 1 for 1st place, 2 for 2nd place, and so on” (Jackson, 2017).

“An interval scale has equal intervals between each number.

A ratio scale is in order and has equal intervals as well as an absolute value on the scale” (Jackson, 2017).

Benet, William, (2019). Psychometrics. Retrieved from www.assessmentpsychology.com ›

Jackson, S. L. (2017). Statistics plain and simple, (4th ed.). Boston, MA: Cengage Learning.

Oxford, (2019). Definition of statistics. Retrieved from https://www.lexico.com/en/definition/statistics

……………………………………………………………

Tina B. Hayes

2. Statistics is used to describe data and draw inferences. Researchers use statistics to collect data and test hypotheses (Jackson, 2017).

Psychometrics is the study of theory and technique of psychological measurement; it measures mental capacities and processes (Shrout & Lane, 2012).

The difference between Descriptive and Inferential Statistics is that descriptive statistics summarize the data using methods such as observation, case studies, and surveys (Jackson, 2017). Inferential statistics allows conclusions to be made based off a sample and uses methods such as correlation and quasi-experimental (Jackson, 2017).

The four kinds of data are nominal, ordinal, interval, and ratio. According to Jackson (2017), nominal scale can be individuals or objects divided into categories that have no numerical properties; ordinal scale are objects or individuals which are divided into categories and can be ranked; interval scale include intervals of equal size between numbers; ratio scale involves an absolute zero indicating the absolute of a variable and includes four properties of measurement magnitude, identity, equal unit size, and absolute zero.

Jackson, S. L. (2017). Statistics plain and simple, (4th ed.). Boston, MA: Cengage Learning.

Shrout, P. E., & Lane, S. P. (2012). Psychometrics. In M. R. Mehl & T. S. Conner (Eds.), Handbook of research methods for studying daily life (pp. 302-320). New York, NY, US: The Guilford Press.