which statistical test is the correct choice for a problem

Project description

Ask yourself a series of questions to figure out which statistical test is the correct choice for a problem. Provide a law enforcement example using each of the following tests.

What level of measurement is the data?

NOMINAL (CATEGORICAL) OR ORDINAL ? Chi-Square.

How many variables are there?

One variable ? One Way Chi-Square.

(a) Use the mathematical formula or

(b) Set the data up to use in SPSS with Nonparametric Tests ? Chi-Square.

Two variables (both are nominal or ordinal) ? Two Way Chi-Square.

(a) Use the formula to calculate the expected frequencies for each cell and then compute chi-square or

(b) Set the data up to use in SPSS with Descriptive Statistics ? Crosstabs ? Statistics ? Chi-Square

INTERVAL OR RATIO ? t-tests or ANOVA

How many samples or groups are there?

One group ? Single Sample t-test.

(a) There will always be a population mean in the question.

(b) The population mean is entered in the Test Value box in the SPSS One Sample T-Test

Two Groups ? Independent Samples t-test or Dependent Samples t-test

Are the samples independent or dependent?

Two independent samples ? Independent Samples t-test.

(a) Two completely different groups, each measured once

Two Dependent samples ? Dependent Samples t-test.

(a) A single group that was measured twice.

(b) Paired Samples T-Test in SPSS

Three or more groups ? Analysis of Variance (ANOVA)