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310 formulas

# 310 formulas - As sample size increases width of the...

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As sample size increases, width of the confidence interval decreases As confidence level is decreased, width of the confidence interval decreases Population – the total collection of elements of interest in a given study Parameter- a number that provides a quantitative description of some characteristic of a population Sample – a subset of population Statistic - a numerical quantity that provides information concerning some characteristic of a sample Statistical inference : The use of sample information to infer something about populations . Variable : A measurable characteristic that takes on different values. Observation : A recorded value of a variable for a particular individual. Data: a set of observations Discrete variables : Variables which take on only isolated values. Continuous variables : Variables that take on values in a continuum (e.g., an interval of numbers) Range: max-min Interquartile Range (IQR): 75 th quantile - 25 th quantile If normal curve fits well then approx 68% of data is within 1 SD, 95%, 2 SD, 99.5% - 3

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310 formulas - As sample size increases width of the...

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