# How to Calculate a Sample Size in SPSS?

Sample sizes are needed in statistics because it isn't always possible to conduct an analysis of an entire population. For example, if you want to know the average height of a beech tree, it would ...
Read More »

http://www.ehow.com/how_7350336_calculate-sample-size-spss.html

## How to Calculate Z-Scores With the SPSS Student Version?

A z-score is a descriptive statistic used to determine how common or extreme a given score is by determining its distance from the mean in standard deviation units. Z-scores are calculated by subtr...
Read More »

http://www.ehow.com/how_7328842_calculate-z_scores-spss-student-version.html

## How to Calculate Variance of a Sample?

In statistics, different values derived from a sample set have significant meanings. One of those values is the variance, which measures the spread of the sample. Other important values like the st...
Read More »

http://www.ehow.com/how_8054971_calculate-variance-sample.html

## How to Decide on a Sample Size?

Researchers make inferences about the population from sample statistics. Inferences such as 10 percent of children in the U.S. who are of age 2 to 5 years are obese are easy to understand. The samp...
Read More »

http://www.ehow.com/how_8294813_decide-sample-size.html

## How Do You Define"Sample Size"?

"Sample size" includes the number of participants or objects in a research study. Researchers use this sample size to represent a larger proportion of their study.DemographicThe most troubling aspe...
Read More »

http://www.answerbag.com/q_view/1884042