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Unformatted text preview: ECON*2740 Lab Problems, Week 2, Winter 2012 Course Instructor: David Prescott Lab Instructor: TBA 1. Mean, variance and skewness A department chain samples 10 stores to collect the following sales data (growth from previous year.) 10.2, 3.1, 5.9, 7.0, 3.7, 2.9, 6.8, 7.3, 8.2, 4.3 (a) Calculate the mean and median sales increase (b) Comment on the symmetry of the distribution 2. Summary Statistics for “Centre” and “Dispersion” The test scores of 40 students are available in the file: week2_data.xlsx In Excel, compute: the mean using the @sum() function; the median by ordering the data; the variance by using @var(); the standard deviation by taking the square root of the variance; the coefficient of variation and the interquartile range. Interpret the interquartile range. ...
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- Fall '11