6) In order to increase customer service, a muffler repair shop claims its mechanics can replace a muffler in 12 minutes. A time management specialist selected six repair jobs and found their mean...


6) In order to increase customer service, a muffler repair shop claims its mechanics can replace a<br>muffler in 12 minutes. A time management specialist selected six repair jobs and found their<br>mean time to be 11.6 minutes. The standard deviation of the sample was 2.1 minutes. At a =<br>0.025, is there enough evidence to conclude that the mean time in changing muffler is less than<br>12 minutes?<br>Solution:<br>I.<br>Statement of the Hypothesis:<br>Но<br>H1<br>II.<br>Statistical Test:<br>III.<br>Level of Significance and Critical Value:<br>IV.<br>Computed value of Z:<br>V.<br>Conclusion:<br>

Extracted text: 6) In order to increase customer service, a muffler repair shop claims its mechanics can replace a muffler in 12 minutes. A time management specialist selected six repair jobs and found their mean time to be 11.6 minutes. The standard deviation of the sample was 2.1 minutes. At a = 0.025, is there enough evidence to conclude that the mean time in changing muffler is less than 12 minutes? Solution: I. Statement of the Hypothesis: Но H1 II. Statistical Test: III. Level of Significance and Critical Value: IV. Computed value of Z: V. Conclusion:

Jun 07, 2022
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