Question

In the past, the average length of an outgoing telephone call from a business office has been 146 seconds. A manager wishes to check whether that average has decreased after the introduction of policy changes. A sample of 100 telephone calls produced a mean of 143 seconds, with a standard deviation of 28 seconds. Perform the relevant test at the 0.05 level of significance.

Name: in the past the average length of an outgoing telephone call from a business office has been 146 seconds a manager wishes to check whether that average has decreased after the introduction o 69265
Uploaded: 2023-05-09T16:30:16-08:00
Duration: 3 min 52 s
Channel: Adi S
Description: in the past the average length of an outgoing telephone call from a business office has been 146 seconds a manager wishes to check whether that average has decreased after the introduction o 69265

          In the past, the average length of an outgoing telephone call from a business office has been 146 seconds. A manager wishes to check whether that average has decreased after the introduction of policy changes. A sample of 100 telephone calls produced a mean of 143 seconds, with a standard deviation of 28 seconds. Perform the relevant test at the 0.05 level of significance.

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Elementary Statistics a Step by Step Approach

Allan G. Bluman 9th Edition

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Solved by Expert Adi S

05/09/2023

Step 1

Null hypothesis: The average length of an outgoing telephone call from a business office is still 146 seconds after the introduction of policy changes. Alternative hypothesis: The average length of an outgoing telephone call from a business office has decreased Show more…

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In the past, the average length of an outgoing telephone call from a business office has been 146 seconds. A manager wishes to check whether that average has decreased after the introduction of policy changes. A sample of 100 telephone calls produced a mean of 143 seconds, with a standard deviation of 28 seconds. Perform the relevant test at the 0.05 level of significance.