S1 Notes

S1 Notes Wednesday 27th May 2010 Mr Aroui purpose the medial, Lower Quartile and Upper Quartile breeding Interpolation: b is the displace class boundary, f is the boldness of all the frequencies below b, [pic]is the frequence of the class, w is the class width. medial: [pic] Lower Quartile: [pic] Upper Quartile: [pic] Decile: [pic] centile: [pic] Finding the Mean, Variance and calendar method of birth control Deviation: Mean: [pic] or [pic] Variance: [pic] or [pic] median(prenominal) Deviation: [pic]or [pic] Finding the Interquartile shake off (IQR) and Semi-Interquartile Range (SIQR): [pic][pic] Outliers: An outlier is whatever foster, which is little than [pic] Greater than [pic] Skewness: The shape(skewness) of a data club stand be described use diagrams, measures of location and measures of spread.A dissemination squirt be symmetrical, possess compulsory skew or have negative skew. development the Quartiles: [pic] and past the statistical statistical statistical distribution is symmetrical. [pic] > [pic] hence the distribution is optimisticly skewed. [pic] < [pic] thence the distribution is negatively skewed.. utilize 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 look upon and tells you how skewed the data is ? The side by side(predicate) to zero the more symmetrical ? A negative number actor the data has negative skew. ? A positive number fashion the data has a positive skew Probability: P(A or B or both) = [pic] P(both A & B) = [pic] P(not A) = [pic] price of admission chance: [pic] Multiplication Rule: [pic] Conditional probability: [pic] crock up Events:If deuce events A and B are independent [pic] [pic] or [pic] Mutually Exclusive Events:If two events A and B cannot both happen together, they are inversely exclusive. [pic] then [pic] Tree Diagrams: ?...If you destitution to get a wide-eyed essay, order it on our website: Orderessay

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