# Shared Flashcard Set

## Details

Bus/Stats
Chapter 3
32
05/29/2009

Term
 Measures of center
Definition
 Descriptive measures that indicate where the center or most typical value of a data set lies
Term
 Mean of a Data Set
Definition
 Is the sum of the observations divided by the number of observations
Term
 Median of a data set
Definition
 arrange numbers in increasing order, it is the one in the middle or the average of the two in the middle
Term
 Mode of a data set
Definition
 the number that occurs the most often
Term
 Resistant Measure
Definition
 Not sensitive to the influence of a few extreme observations
Term
 Trimmed means
Definition
 when the smallest and the largest observations are removed before computing the mean
Term
 Population mean or mean of the variable
Definition
 the mean of the population data
Term
 Sample Mean
Definition
 The mean of the sample data
Term
 Sample size
Definition
 the number of observations
Term
 Sample Mean
Definition
 For a variable x, the mean of the observations for a sample is called a sample mean and looks like what?
Term
 Range of a Data set
Definition
 Range= Max - Min
Term
 Standard deviation
Definition
 Measures variation by indicating how far, on average, the observations are from the mean
Term
 Deviations from the Mean
Definition
 How far each observation is from the mean
Term
 Sum of Squared Deviations
Definition
 re equation pg 108
Term
 Sample Standard Deviation
Definition
 Re pg 110
Term
 Variation and the Standard Deviation
Definition
 The more variation there is in a data set, the larger is its standard deviation
Term
 Computing Formula for a Sample Standard Deviation
Definition
 re pg 111
Term
 Chebychev's Rule
Definition
 Atleast 89% of the observations lie within three standard deviations to either side of the mean
Term
 Empirical Rule
Definition
 roughly 99.7% of the observations lie within three standard deviations to either side of the mean
Term
 Percentiles
Definition
 data set divided into hundreths or a 100 equal parts
Term
 Deciles
Definition
 Divide a data set into tenths
Term
 Quintiles
Definition
 divide a data set into fifths
Term
 Quartiles
Definition
 Divide a data set into quaters
Term
 Q1
Definition
 bottom 25% of data from the top 75% of Q2
Term
 Q2
Definition
 Median
Term
 Q3
Definition
 the median of the portion of the entire data set that lies at or above the median of the entire data set
Term
 Interquartile Range
Definition
 IQR is the difference between the first and third quartiles IQR=Q3 - Q1
Term
 Five-Number Summary
Definition
 Min, Q1, Q2, Q3, Max
Term
 Lower Limit
Definition
 =Q1-1.5 * IQR
Term
 Upper Limit
Definition
 Q3+1.5 * IQR
Term
 To construct a boxplot
Definition
 1) Determine the 5-number summary2) Draw a horizontal axis on which the numbers obtained in step 1 can be located. Above this axis, mark the quartiles and the min and max with vertical lines3) Connect the quartiles to make a box and then connect the box to the min and max with lines
Term
 To construct a modified boxplot
Definition
 re pg 124
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