STATISTICS

mean=most common average

sum of all values computer, then divide the sum by the total of values

sample

In statistics and quantitative research methodology, a data sample is a set of data collected and/or selected from a statistical population by a defined procedure. ... Typically, the population is very large, making a census or a complete enumeration of all the values in the population is either impractical or impossible.

spread

In statistics, dispersion (also called variability, scatter, or spread) is the extent to which a distribution is stretched or squeezed. Common examples of measures of statistical dispersion are the variance, standard deviation, and interquartile range.

inferential statistics (data set)

Inferential statistical analysis infers properties about a population: this includes testing hypotheses and deriving estimates. The population is assumed to be larger than the observed data set; in other words, the observed data is assumed to be sampled from a larger population.

inferential statistics

Inferential statistics makes inferences about populations using data drawn from the population. Instead of using the entire population to gather the data, the statistician will collect a sample or samples from the millions of residents and make inferences about the entire population using the sample.

mean(average) capital M=mean

M=typical or average score. List all values, count number of values then divide by the number of values=mean

nominal level of measurement

A variable has one of four different levels of measurement: Nominal, Ordinal, Interval, or Ratio. (Interval and Ratio levels of measurement are sometimes called ...

Data

Data. ... Just as trees are the raw material from which paper is produced, so too, can data be viewed as the raw material from which information is obtained. In fact, a good definition of data is "facts or figures from which conclusions can be drawn". Data, information and statistics are often misunderstood.

what are descriptive statistics

Descriptive statistics are brief descriptive coefficients that summarize a given data set, which can be either a representation of the entire population or a sample of it. Descriptive statistics are broken down into measures of central tendency and measures of variability, or spread.

descriptive statistics

Descriptive statistics are used to describe the basic features of the data in a study. They provide simple summaries about the sample and the measures.

ratio

Numbers can be grouped into 4 types or levels: nominal, ordinal, interval, and ratio. Nominal is the most simple, and ratio the most sophisticated. ... The binary category of 0 and 1 used for computers is a nominal level of measurement. They are categories or classifications.

The median is the middle of the set of numbers.

The median is the middle number. To calculate the median of any set of numbers, you need to write the numbers in order. ... If there is an odd number of results, the median is the middle number. If there is an even number of results, the median will be the mean of the two central numbers.

Steps to calculate the standard deviation

To calculate the standard deviation of those numbers: Work out the Mean (the simple average of the numbers) Then for each number: subtract the Mean and square the result. Then work out the mean of those squared differences. Take the square root of that and we are done!

population mean

he term population mean, which is the average score of the population on a given variable, is represented by: μ = ( Σ Xi ) / N The symbol 'μ' represents the population mean. The symbol 'Σ Xi' represents the sum of all scores present in the population (say, in this case) X1 X2 X3 and so on. The symbol 'N' represents the total number of individuals or cases in the population.

inferential statistics definition

inferential statistics makes inferences about populations using data drawn from the population. Instead of using the entire population to gather the data, the statistician will collect a sample or samples from the millions of residents and make inferences about the entire population using the sample

weighted mean

list all the values in the sample, list frequency which each value occurs, multiply the values by the frequency, sum all the values in the value x frequency column, divide by the total frequency

What is the mode

mode is a set of values that appears most often

mode

most frequent number in the data set

Median is the midpoint of a set of scores

place the numbers you are given in value order and find the middle number.