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A-class-contains-20-students-of-whom-2-are-men-and-8-are-women-A-random-sample-of-2-students-is-taken-from-the-class-without-replacement-random-imlies-that-each-student-has-an-equal-chance-of-appe




Question Number 140596 by nadovic last updated on 10/May/21
  A class contains 20 students of whom 2  are men and 8 are women. A random  sample of 2 students is taken from the  class without replacement. (random  imlies that each student has an equal  chance of appearing in the sample)  (a) Use a diagram to illustrate the possible  otcomes.  (b)Consider how that the  probabiliies would change if the  sampling was with replacement.
$$ \\ $$$$\mathrm{A}\:\mathrm{class}\:\mathrm{contains}\:\mathrm{20}\:\mathrm{students}\:\mathrm{of}\:\mathrm{whom}\:\mathrm{2} \\ $$$$\mathrm{are}\:\mathrm{men}\:\mathrm{and}\:\mathrm{8}\:\mathrm{are}\:\mathrm{women}.\:\mathrm{A}\:\mathrm{random} \\ $$$$\mathrm{sample}\:\mathrm{of}\:\mathrm{2}\:\mathrm{students}\:\mathrm{is}\:\mathrm{taken}\:\mathrm{from}\:\mathrm{the} \\ $$$$\mathrm{class}\:\mathrm{without}\:\mathrm{replacement}.\:\left(\mathrm{random}\right. \\ $$$$\mathrm{imlies}\:\mathrm{that}\:\mathrm{each}\:\mathrm{student}\:\mathrm{has}\:\mathrm{an}\:\mathrm{equal} \\ $$$$\left.\mathrm{chance}\:\mathrm{of}\:\mathrm{appearing}\:\mathrm{in}\:\mathrm{the}\:\mathrm{sample}\right) \\ $$$$\left({a}\right)\:\mathrm{Use}\:\mathrm{a}\:\mathrm{diagram}\:\mathrm{to}\:\mathrm{illustrate}\:\mathrm{the}\:\mathrm{possible} \\ $$$$\mathrm{otcomes}. \\ $$$$\left({b}\right)\mathrm{Consider}\:\mathrm{how}\:\mathrm{that}\:\mathrm{the} \\ $$$$\mathrm{probabiliies}\:\mathrm{would}\:\mathrm{change}\:\mathrm{if}\:\mathrm{the} \\ $$$$\mathrm{sampling}\:\mathrm{was}\:\mathrm{with}\:\mathrm{replacement}. \\ $$

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