The supervisor of a tourist information desk at a local airport is interested in how long it takes an employee to serve a customer. Using a stopwatch, he measures the amount of time it takes for each of 10 customers.
These times, measured in minutes, are reported as follows: 2.3, 1.5, 3.9, 0.6, 2.7, 3.1, 2.8, 0.9, 1.4, and 2.6. Calculate the standard deviation and the interquartile range.
Question 2
Which of the following tests employs matched-pairs sampling?
A) The Wilcoxon signed rank test
B) The Wilcoxon rank sum test
C) The Mann-Whitney test
D) The Durbin-Watson test
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