Math  /  Data & Statistics

QuestionQuestion 10 of 15, Step 2 of 3 Correct
The board of a major credit card company requires that the mean wait time for customers when they call customer service is at most 3.50 minutes. To make sure that the mean wait time is not exceeding the requirement, an assistant manager tracks the wait times of 41 randomly selected calls. The mean wait time was calculated to be 3.94 minutes. Assuming the population standard deviation is 1.30 minutes, is there sufficient evidence to say that the mean wait time for customers is longer than 3.50 minutes with a 95%95 \% level of confidence? Step 2 of 3 : Compute the value of the test: statistic. Round your answer ter two decimal places.
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Studdy Solution
Calculate the z-value:
z=0.440.2032.17z = \frac{0.44}{0.203} \approx 2.17
The value of the test statistic is approximately:
2.17 \boxed{2.17}

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