ex a sample of 765 voters exit polled on election day Parameter A descriptive

# Ex a sample of 765 voters exit polled on election day

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ex. a sample of 765 voters exit polled on election day. Parameter: A descriptive measure of a population. Populations have parameters, samples have statistics Statistic: A descriptive measure of a sample Confidence level: The proportion of times that an estimating procedure will be correct. ex. a confidence level of 95% means that, estimates based on this form of statistical inference will be correct 95% of the time. Significance level: WHen the purpose of the statistical inference is to draw a conclusion about a population. Measures how frequently the conclusion will be wrong in the long run. ex. a 5% significance level means that, in the long run, this type of conclusion will be wrong 5% of the time. Chapter two Variable: Some characteristic of a population or sample ex. student grades represented by a capital letter
Values: Range of possible values of the variable ex. student marks (0...100) Data: The observed values of a variable ex. student marks { 67, 74, 71, 83, 93, 55, 48} Types of Data and Information Interval Data Real numbers Also referred to as quantitative or numerical Nominal Data The values of nominal data are categories categorical Qualitative or caterorical ex. responses to questions about marital status, codes as: Single = 1, Married =

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• Spring '11
• Leany
• Statistics, Notes, Nominal Data, Data and Information, Business Stats I