628 words - 3 pages

* **X^T means not on the exam!!**

* System components:

* These are NOT CONSTANT! They VARY.

Time

Space

Measurement

* Data are the facts and figures collected, summarized, analyzed, and interpreted

* The data collected in a particular study are referred to as the data set

* The elements are the entities on which data are collected

* A variable is a characteristic of interest for the elements

* The set of measurements collected for a particular element is called an observation

* A data set with n elements contains n observations

* The total number of data values in a complete data set is the number of elements multiplied by the number of variables.

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Weight, height)

* If the measures are computed for data from a sample, thy are called sample statistics

* Mean

* Average of the data values

* Sample mean is represented by x bar and the sum of all the data values is divided by n

* Population mean is represented by a lowercase Mu and the sum of all the data values is divided by N

* Median

* Value that is the middle after they are arranged in ascending order

Odd number: number in the middle after ascending order

Even number: average of two middle values after put in ascending order

* Mode

* Data value that occurs the most

* Bimodal= two modes

* Multimodal= multiple modes

* Proportion

* Sample proportion= p hat= x/n

* Population proportion= p= X/N

* Range

* Difference between the larges and smallest data values

* Simplest value of variability

* Variance

* Denominator is different for the sample and the population

*...

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