S1 Notes

S1 Notes Wednesday 27th May 2010 Mr Aroui Finding the medial, Lower Quartile and Upper Quartile development Interpolation: b is the lower class boundary, f is the touchwood of all the frequencies below b, [pic]is the frequency of the class, w is the class width. median appraise: [pic] Lower Quartile: [pic] Upper Quartile: [pic] Decile: [pic] Percentile: [pic] Finding the Mean, Variance and thump out Deviation: Mean: [pic] or [pic] Variance: [pic] or [pic] prevalent Deviation: [pic]or [pic] Finding the Interquartile Range (IQR) and Semi-Interquartile Range (SIQR): [pic][pic] Outliers: An outlier is whatever foster, which is less(prenominal) than [pic] Greater than [pic] Skewness: The shape(skewness) of a data club fuel be described using diagrams, measures of location and measures of spread.A dissemination finish be biradial, rescue compulsory skew or have prejudicious skew. development the Quartiles: [pic] and thusly the statistical dissemination is symmetrical. [pic] > [pic] hence the distribution is positively skewed. [pic] < [pic] then the distribution is negatively skewed.. use the Measures of location (Mode, Median & Mean): [pic] describes a distribution which is symmetrical. [pic] < [pic]< [pic] describes a distribution which positive skew. [pic] > [pic]> [pic] describes a distribution which negative skew.

[pic] this gives you a value and tells you how skewed the data is ? The closer to zero the more symmetrical ? A negative number means the data has negative skew. ? A positive number means t! he data has a positive skew Probability: P(A or B or both) = [pic] P(both A & B) = [pic] P(not A) = [pic] admittance Rule: [pic] Multiplication Rule: [pic] conditional probability: [pic] separate Events:If two events A and B be independent [pic] [pic] or [pic] Mutually Exclusive Events:If two events A and B cannot both happen together, they are mutually exclusive. [pic] then [pic] Tree Diagrams: ?...If you indigence to get a full essay, show it on our website: BestEssayCheap.com

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