In statistics, a variable is a characteristic of interest that you measure, record, and analyze.Statisticiansunderstand them by defining the type of information they record and their role in an experiment or st
FeatureParameter definition in MathParameter definition in Statistics DefinitionA value used to calculate the value of another variableA numerical characteristic of a population SymbolRoman lowercase such as x, y, zGreek letters such as μ, σ or Roman lowercase. ...
In multivariate statistics, why examine your data and what are the principal aspects of data that need to be examined? Name one reason why a predictor variable may be included in a multiple regression model which is used for prediction, even...
In the 1940s, Stanley Smith Stevens introduced four scales of measurement: nominal, ordinal, interval, and ratio. These are still widely used today as a way to describe the characteristics of a variable. Knowing the scale of measurement for a variable is an important aspect in choosing the ri...
What is Statistics?The science of statistics deals with the collection, analysis, interpretation, and presentation of data. We see and use data in our everyday lives.Learning Outcomes Explain the difference between descriptive and inferential statistics For a given scenario, identify the popul...
The basic function of a variable speed drive (VSD) is to control the flow of energy from the mains to the process.
A test statistic is a random variable that is calculated from sample data and used in a hypothesis test. You can use test statistics to determine whether to reject the null hypothesis. The test statistic compares your data with what is expected under the null hypothesis. The test statistic ...
X is a random variable E(X) = μ is the expected value (themean) of the random variable X and E(Y) = ν is theexpected value(the mean) of the random variable Y n = the number of items in the data set. Σsummation notation. ...
By Ruben Geert van den BergunderT-Tests&Statistics A-Z Adichotomous variableis a variable that contains precisely two distinct values.Let's first take a look at some examples for illustrating this point. Next, we'll point out why distinguishing dichotomous from other variables makes it easier to...
The i-th position In Elementary Statistics and Probability Theory, the little number next to a variable, say the i inXirepresents the i-th position of said variable. These types of subscripts are commonly seen when working with summation notation and is seen in the following form ...