BUSS1020 Final: numerical descriptive data
Document Summary
Numerical descriptive measure (cid:153) central tendency: extent to which the data values group around a typical or central value. Variation: amount of dispersion or scattering of values around the central value. Shape: pattern in the distribution of values from the lowest to the highest (cid:120) mean (cid:131) arithmetic mean: all the values play an equal role. *skewness: describe the amount of asymmetry in distribution. Interquartile range (mid-spread): the difference between the third quartile and the first quartile. (cid:120) q1 = (n+1)/4 & q3 = 3(n+1)/4. Interquartile range = q3 q1 (cid:131) x smallest, q1, median, q3, x largest (cid:120) five-number summary: provide a way to determine shape of distribution (cid:120) left skewed: distance to median from x smallest larger than distance from largest. Histogram: data analysis -> histogram -> select bins and input range. Cumulative chart: data analysis -> input range and output range (bins) -> cumulative. Format data series: click data -> change gap width to 0% (continuous)
