STA 13 Midterm: statistics midterm 1 study guide
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Denotes the sum of a set of data values. X - is the variable usually used to represent the individual data values. N - represents the number of data values in a sample. N - represents the number of data values in a population. X = x/n - mean of a set of sample values. Or m = x/n - mean of all values in a population. Don"t need to know short cut formula for variance, just regular formula. You should be able to calculate sample and population means, variances, and standard deviation from a set of numbers, a frequency table, and a relative frequency table. You will be given the following formulas on the exam. P(cid:857)(cid:882) (cid:928)r (cid:883)(cid:858) = p(cid:857)(cid:882)(cid:858) + p(cid:857)(cid:883)(cid:858) p(cid:857)(cid:882) a(cid:927)(cid:917) (cid:883)(cid:858) Population: a collection of items or individuals we"re interested in. Sample: a subset of population which is either selected or available for taking measurements.
