EGN 2440 Probability and Statistics for Engineers Einal Exam development. Rats w
ID: 3321736 • Letter: E
Question
EGN 2440 Probability and Statistics for Engineers Einal Exam development. Rats were raised tested on a variety of learning researchers examined the Impact of environment on rat under controlled conditions: for two months, after which, they were t measures and assigned an overall learning score. The data are as _ 22 19 15 24 18 17 21 15 12 19 12 14 7 10 9 12 9 15 1. Sketch a stem-leaf diagram for this data (2 points) 2. What is the median learning score for this sample of rats? (1 point) 3. What is the sample mean? (1 point) 4. What is the 75th percentile learning score? (1 point) 5. What is the sample variance? (1 point) 6. What is the mode of this data? (1 point)Explanation / Answer
1. Stem-and-Leaf Display: Data
Stem-and-leaf of Data N = 20
Leaf Unit = 1.0
1 0 7
4 0 899
6 1 01
9 1 222
(4) 1 4555
7 1 7
6 1 899
3 2 1
2 2 2
1 2 4
2. Median = 14.5
3. Sample mean = 289.00 / 20 = 14.45
4. 75th percentile = 18.75
5. Sample variance: 24.16
6. Mode: 12 and 15 since these occur maximum 3 times compare to all other elements
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