Sample Problems for Quiz 3

Sample Problems for Quiz 3 - STT 315 Spring 2008 Sample...

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STT 315 Sample Problems for Quiz 3 Spring 2008 1. The wages of a random sample of National Bank black female hourly workers are given in the following data set: 16015 17516 17274 16555 20788 19312 17124 18405 19090 12641 17813 18206 19338 15953 16904 18346 a) Find the first quartile, the median, the third quartile, and the interquartile range for this set of data. b) Draw a boxplot for the data. Are there any outliers? Is the distribution of the data symmetric or skewed? If it is skewed, to what side? c) If we remove the value 12641 from the set of data, would you say the distribution is symmetric or skewed? 2. Below is a random sample of the number of calls received between 8 A.M. and 9 A.M. by a software developer’s technical support line: 13 20 14 12 21 18 12 14 17 23 9 12 10 13 20 12 18 20 13 13 11 14 13 10 14 19 12 18 20 20 25 13 13 17 14 18 21 28 13 23 10 13 22 19 14 15 15 23 13 a) Finish the stem-and-leaf plot started below (I’ve done the first row of the data set). The stem (the tens digit)
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Sample Problems for Quiz 3 - STT 315 Spring 2008 Sample...

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