# Shared Flashcard Set

## Details

Week 1 Final Slides
Week 1 Slides
24
10/24/2011

Term
 WHAT ARE STATISTICS?
Definition
 A set of tools and techniques that is used for describing, organizing, and interpreting information or data.
Term
 WHAT ARE DESCRIPTIVE STATISTICS?
Definition
 USED TO ORGANIZE AND DESCRIBE THE CHARACTERISTICS OF THE COLLECTION OF DATA.THE COLLECTION IS SOMETIMES CALLED A DATA SET OR JUST DATA
Term
 What are INFERENTIAL STATISTICS?
Definition
 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.
Term
 Sample
Definition
 A SMALLER GROUP OF DATA THAT IS OFTEN A PORTION OR SUBSET OF A POPULATION
Term
 All freshmen at King College represent a
Definition
 population
Term
 All freshman living in Virginia represent a
Definition
 sample
Term
 parameter
Definition
 a numerical summary of a population
Term
 what is formula
Definition
 A SET OF MATHEMATICAL OPERATIONS THAT PERFORMS A PARTICULAR MATHEMATICAL TASK
Term
Definition
 USED TO PREDICT THE VALUE OF Y FROM OUR KNOWLEDGE OF THE VALUES OF b, X, and a
Term
 function
Definition
 A PREDEFINED FORMULAExample:There are groups of mathematical, data-base, and logical functions.
Term
 range
Definition
 A COLLECTION OF CELLSTHE RANGE IS THE SIMPLEST MEASUREMENT OF DISPERSION
Term
 CALCULATION OF RANGE
Definition
 SIMPLY TAKING THE DIFFERENCE BETWEEN THE MINIMUM AND MAXIMUM VALUES IN THE DATA SET
Term
 Measures of Central Tendency
Definition
 mean, median, mode
Term
 averages
Definition
 MEAN-THE MOST COMMON AVERAGEIMPORTANT— THE MEAN IS THE MEASURE OF CENTRAL TENDENCY THAT MOST ACTURATELY REFLECTS THE POPULATION MEAN BEWARE OF EXTREMES
Term
 True or false,Mean is very sensitive to extremes
Definition
 True
Term
 WEIGHTED MEAN
Definition
 USE WHEN THERE IS AN OCCURANCE OF MORE THAN ONE VALUE
Term
 Median
Definition
 MIDPOINT IN A SETIf 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
Term
 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.
Term
 Frequency Distribution
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.
Term
 CLASS INTERVALS
Definition
 How the scores are grouped
Term
 CLASS FREQUENCY IS
Definition
 THE NUMBER OF TIMES THE NUMBER OF OBSERVATIONS APPEAR IN EACH CLASS
Term
 HISTOGRAM—
Definition
 A GRAPH WHICH SHOWS THE FREQUENCY DISTRIBUTION FOR QUANITATIVE DATA
Term
 WHERE WE USE SD
Definition
 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.
Supporting users have an ad free experience!