Final Study Guide

Front

What is the range of a set of scores?

Back

The range is the difference between the highest and lowest scores in a set. For example, if the highest score is 193 and the lowest is 127, the range is 193 - 127 = 66.

Front

How do you calculate the Z-score?

Back

The Z-score is calculated using the formula: Z = (x - mean) / standard deviation. For example, if the mean is 22, standard deviation is 3.1, and x is 29, then Z = (29 - 22) / 3.1 = 2.26.

Front

What is a stratified sample?

Back

A stratified sample is a sampling method where the population is divided into subgroups (strata) that share similar characteristics, and random samples are taken from each stratum.

Front

List the different types of sampling methods.

Back

The different types of sampling methods include: random sampling, stratified sampling, systematic sampling, cluster sampling, and convenience sampling.

Front

What are the two branches of statistics?

Back

The two branches of statistics are inferential statistics and descriptive statistics.

Front

Define inferential statistics.

Back

Inferential statistics involves making predictions or inferences about a population based on a sample of data.

Front

Define descriptive statistics.

Back

Descriptive statistics involves summarizing and organizing data to describe its main features.

Front

What is the formula for calculating the mean?

Back

The mean is calculated by adding all the values in a data set and dividing by the number of values. Mean = (Sum of all values) / (Number of values).

Front

What is a sample in statistics?

Back

A sample is a subset of a population used to represent the entire group in statistical analysis.

Front

What is the purpose of random sampling?

Back

The purpose of random sampling is to ensure that every member of the population has an equal chance of being selected, which helps to eliminate bias.