Question
Professor Smith took a sample of 208 students from her morning class and a sample of 119 students from her evening class. On Exam 1,
Professor Smith took a sample of 208 students from her morning class and a sample of 119 students from her evening class. On Exam 1, all those sampled from the morning class got a 70 while those sampled from the evening class averaged a 69 with a variance of 182. If Professor Smith combines these two samples.
1. What is the combined Exam 1 average?
2. What is the combined Exam 1 median?
3. What is the shape of the combined Exam 1 grade distribution?
4. What is the combined Exam 1 standard deviation?
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Introductory Statistics
Authors: Prem S. Mann
8th Edition
9781118473986, 470904100, 1118473981, 978-0470904107
