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A set of tools and techniques that is used for describing, organizing, and interpreting information or data. 


Term
WHAT ARE DESCRIPTIVE STATISTICS? 

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USED TO ORGANIZE AND DESCRIBE THE CHARACTERISTICS OF THE COLLECTION OF DATA. THE COLLECTION IS SOMETIMES CALLED A DATA SET OR JUST DATA 


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What are INFERENTIAL STATISTICS? 

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OFTEN (BUT NOT ALWAYS) THE NEXT STEP AFTER DAT IS COLLECTED AND SUMMARIZED.
IT IS USED TO MAKE AN INFERENCE FROM A SMALLER GROUP OF DATA. 


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A SMALLER GROUP OF DATA THAT IS OFTEN A PORTION OR SUBSET OF A POPULATION 


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All freshmen at King College represent a 

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All freshman living in Virginia represent a 

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Definition
a numerical summary of a population 


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A SET OF MATHEMATICAL OPERATIONS THAT PERFORMS A PARTICULAR MATHEMATICAL TASK 


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USED TO PREDICT THE VALUE OF Y FROM OUR KNOWLEDGE OF THE VALUES OF b, X, and a 


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A PREDEFINED FORMULA Example: There are groups of mathematical, database, and logical functions. 


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A COLLECTION OF CELLS
THE RANGE IS THE SIMPLEST MEASUREMENT OF DISPERSION 


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SIMPLY TAKING THE DIFFERENCE BETWEEN THE MINIMUM AND MAXIMUM VALUES IN THE DATA SET 


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Measures of Central Tendency 

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MEANTHE MOST COMMON AVERAGE IMPORTANT— THE MEAN IS THE MEASURE OF CENTRAL TENDENCY THAT MOST ACTURATELY REFLECTS THE POPULATION MEAN BEWARE OF EXTREMES 


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True or false, Mean is very sensitive to extremes 

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USE WHEN THERE IS AN OCCURANCE OF MORE THAN ONE VALUE 


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MIDPOINT IN A SET If both the mean and median are “measures of central tendency” or averages, 


Term
Why would you use median instead of mean 

Definition
THE MEDIAN IS INSENSTIVE TO EXTREME SCORES WHERE THE MEAN IS NOT 


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STANDARD DEVIATION (SD) THE AVERAGE AMOUNT OF VARIABILITY 

Definition
is a widely used measure of variability or diversity used in statistics . It shows how much variation there is from the average (mean, or expected value). A low standard deviation indicates that the data points tend to be very close to the mean, whereas high standard deviation indicates that the data points are spread out over a large range of values. 


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Definition
In statistics a frequency distribution is an arrangement of the values that one or more variables take in a sample. Each entry in the table contains the frequency or count of the occurrences of values within a particular group or interval, and in this way, the table summarizes the distribution of values in the sample. 


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Definition
How the scores are grouped 


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THE NUMBER OF TIMES THE NUMBER OF OBSERVATIONS APPEAR IN EACH CLASS 


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A GRAPH WHICH SHOWS THE FREQUENCY DISTRIBUTION FOR QUANITATIVE DATA 


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In addition to expressing the variability of a population, standard deviation is commonly used to measure confidence in statistical conclusions. For example, the margin of error in polling data is determined by calculating the expected standard deviation in the results if the same poll were to be conducted multiple times. 

