Summary statistics Exam Questions With 100% Correct Answers

Summary statistics Exam Questions With 100% Correct Answers Summary statistics - answer- The first thing you want to do in Data analysis - describe data sets or relationships between variables with one or a few numbers: - What is the central value? - How widely are values spread from the center? - Are there data that are very atypical? - Are variables related? Why central tendency? - answer- You can't report the 1000 values to your boss! - Describe a whole set of data with a single value that represents a central or typical value for the distribution. Mean - answer- the sum of the value of each observation in a dataset divided by the number of observations Median - answer- the "middle" number when those numbers are listed in order from smallest to greatest. When dataset x is ordered: Mode - answer- the value that appears most often in a set of data values three main measures of central tendency - answer- mean - median - mode central tendency - answer- do not work on nominal or ordinal scale - sensitivity to outliers Measures of variability - answer- Dispersion: variance, standard deviation, interquartile range, and range Variance - answerThe sum of the squared deviations from the mean divided by the number of observations minus one.