1 / 6

Review of Statistics

Review of Statistics. Mean, Median, Mode and Range. Mean – The sum of the data divided by the number of items in the data set. Median – T he middle number of the data ordered from least to greatest, or the mean of the middle two numbers. Mode – The number or numbers that occur most often.

aoife
Download Presentation

Review of Statistics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Review of Statistics

  2. Mean, Median, Mode and Range • Mean – The sum of the data divided by the number of items in the data set. • Median – The middle number of the data ordered from least to greatest, or the mean of the middle two numbers. • Mode – The number or numbers that occur most often. • There can be more than one mode. • Range - The difference between the largest number in the data set and the smallest number in the data set.

  3. Measures of Variation • Lower quartile (LQ) • The median of the lower half of the set of data. • Upper quartile (UQ) • The median of the upper half of the set of data. • Interquartile range • The range of the middle half of the data. • The difference between the upper quartile and the lower quartile. • Outlier • Avalue that is much greater or much less than the median. • Data that are more than 1.5 times the value of the interquartile range beyond the quartiles.

  4. Practice Problem • Find the median, upper and lower quartiles, interquartile range and any outliers for the following data set: 81, 79, 88, 67, 89, 87, 85, 83, 83 Put them in order from least to greatest: 67, 79, 81, 83, 83, 85, 87, 88, 89 Upper half: 85, 87, 88, 89 Upper Quartile (87+88)÷2 = 87.5 Lower half: 67, 79, 81, 83 Lower Quartile (79+81)÷2 = 80 83 is the median Outliers 7.5(1.5) = 11.25 Lower limit 80-11.25 = 68.75 Upper limit 87.5+11.25 = 98.75 Interquartile range Upper Quartile – Lower Quartile 87.5 – 80 = 7.5 67 is an outlier because it is less than 68.75

  5. Reading Box-and-Whisker Plots • A professor asked her students to keep track of how many websites they visit each day. This box-and-whisker plot shows the results. Find the following values: Minimum: LQ: Maximum: UQ: Range: Interquartile Range: Median: 4 5 10 8 6 3 7

  6. Stem & Leaf Plot • Make a stem and leaf plot for the following data set: 78, 67, 54, 46, 77, 65, 53, 43, 75, 64, 52, 40, 51, 62,and 50 Stem Leaf 40 3 6 50 1 2 3 4 62 4 5 7 7 5 7 8

More Related