Answer to Question #6270 in Statistics and Probability for jineen
observations in that case would be relatively independent. However, we still
won't get clean statistical data because computer generates pseudo-random
numbers, not random numbers.
Clerk shouldn't use method A because he can get
a biased sample in this case. In real life situations client's last names are
not uniformly distributed along the alphabet. That's why among 5,000 companies
we can get 200 companies with letter 'N' and only 1 company with letter 'Y'. So,
when the clerk selects one company for each letter, he will always have to
choose 1 company from 200 for 'N' but the same company for 'Y' every time. Such
statistical data cannot be used for analysis.
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