# Understanding standard deviation and z score.

Not what you're looking for?

Please answer the following question:

- Explain thoroughly, the concept of standard deviation.

- How does range affect standard deviation?

- What is a z-score, and how do z-scores relate to the mean of a set of data?

- Generally speaking, how is the percentage of data which lies in between two z-scores calculated?

##### Purchase this Solution

##### Solution Summary

Standard deviation and z score are discussed.

##### Solution Preview

The range is the simplest measure of spread or dispersion: It is equal to the difference between the largest and the smallest values. The range can be a useful measure of spread because it is so easily understood. However, it is very sensitive to extreme scores since it is based on only two values.

The variance is a measure of how spread out a distribution is. It is computed as the average squared deviation of each number from its mean. The ...

##### Purchase this Solution

##### Free BrainMass Quizzes

##### Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.

##### Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.

##### Know Your Statistical Concepts

Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.

##### Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.