A set of 16 real numbers each number is multiplied by a positive real number. After multiplication, the variance of the resulting set of numbers is found to be 6·25 times the variance of the set of numbers before multiplication. What is the number which was used to multiply all the observations?
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Descriptive statistics and dispersion has come up 117 times in 6 exams since 2004.
This question is on Measures of dispersion, part of Descriptive statistics and dispersion in Statistics.
How spread out data are: range, variance, standard deviation and relative measures.
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Question from the JNU SSS 2014 paper. Solutions are TestStop's own. Not affiliated with or endorsed by any examination authority.