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| Descriptive measures that indicate where the center or most typical value of a data set lies |
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| Is the sum of the observations divided by the number of observations |
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| arrange numbers in increasing order, it is the one in the middle or the average of the two in the middle |
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| the number that occurs the most often |
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| Not sensitive to the influence of a few extreme observations |
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| when the smallest and the largest observations are removed before computing the mean |
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| Population mean or mean of the variable |
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Definition
| the mean of the population data |
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| The mean of the sample data |
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| the number of observations |
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| For a variable x, the mean of the observations for a sample is called a sample mean and looks like what? |
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| Measures variation by indicating how far, on average, the observations are from the mean |
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| How far each observation is from the mean |
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| Sum of Squared Deviations |
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Definition
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| Sample Standard Deviation |
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Definition
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| Variation and the Standard Deviation |
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Definition
| The more variation there is in a data set, the larger is its standard deviation |
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| Computing Formula for a Sample Standard Deviation |
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| Atleast 89% of the observations lie within three standard deviations to either side of the mean |
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| roughly 99.7% of the observations lie within three standard deviations to either side of the mean |
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Definition
| data set divided into hundreths or a 100 equal parts |
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Term
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Definition
| Divide a data set into tenths |
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Definition
| divide a data set into fifths |
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Term
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| Divide a data set into quaters |
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| bottom 25% of data from the top 75% of Q2 |
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| the median of the portion of the entire data set that lies at or above the median of the entire data set |
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Definition
| IQR is the difference between the first and third quartiles IQR=Q3 - Q1 |
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Term
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Definition
1) Determine the 5-number summary
2) 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 lines
3) Connect the quartiles to make a box and then connect the box to the min and max with lines |
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Term
| To construct a modified boxplot |
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Definition
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