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Bit Class Notes Essay

628 words - 3 pages

* **X^T means not on the exam!!**
* System components:
* These are NOT CONSTANT! They VARY.
* 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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