WGU 955

WGU C955 - Module 4 Descriptive Statistics for a Single Variable questions and answers

median vs IQR skewed data uses these for center and spread Histogram - when to use Based on the shape of the distribution, uses mean + standard deviation OR median + IQR to describe center and spread - Larger data sets; shows shapes of distribution and potential outliers; ignores the individual data valuesl Histogram Skewed right Not a symmetric distribution, the tail is on the right Standard Deviation Rule 68% of the data are within 1 standard deviation, 95% are...

Discrete data Has distinct values, can be counted, had unconnected points (think dots) Continuous data Has values within a range, measured not counted, does not have gaps between data points (data is connected lines or curves). Example of discrete data Days of the week Expressions A group of symbols such as numbers and operators that has mathematical validity Commutative The order in which the numbers appear in the sum can be reversed Identity property Ad...

Histogram A graphical representation -- bars, measuring the frequency within each interval Skewed right Not a symmetric distribution, the tail is on the right Measures of center Median, the mean (and mode) Measures of spread Range, IQR & standard deviation Standard Deviation Rule 68% of the data are within 1 standard deviation, 95% are within 2, 99.7% are within 3 standard deviations from the mean. median (for center) & IQR (for spread) skewed data uses...