Random-digit dialing. To ascertain the effectiveness of their advertising campaigns, firms frequently conduct telephone interviews with consumers by using random-digit dialing. With this method, a random-number generator mechanically creates the sample of phone numbers to be called.
a. Explain how the random-number table (Table I of Appendix A) or a computer could be used to generate a sample of seven-digit telephone numbers.
b. Use the procedure you described in part a to generate a sample of 10 seven-digit telephone numbers.
c. Use the procedure you described in part a to generate 5 seven-digit telephone numbers whose first three digits are 373.
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