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A salesman paid 12 visitsto his area sales manager and noted that he had to wait for 10,15,20,17,11,25,30,27,36,40,5 and26 min the area sales manager claim

salesman do not have to wait for more than 20 min before being called using the sign test verify at 0.05 level of significance the claim made by area sales manager


50% of the waits are more than 20 minutes.
25,30,27,36,40 and 26.

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