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In the past the average length of an outgoing telephone call from a business office has been 143 seconds. A manager wishes to check whether
In the past theaveragelength of an outgoing telephone call from a business office has been 143 seconds. A manager wishes to check whether that average hasdecreasedafter the introduction of policy changes. Asampleof 100 telephone calls produced ameanof 133 seconds, with astandard deviationof 35 seconds. i need help with perform the relevant test at the 1% level of significance.
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