Statistics
1060
Solutions to Practice Problems for Week 1
Answers to 1.15, 1.25, 1.55 and 1.61 in back of the text
1.
2.
number of close friends x |
frequency f |
relative frequency f/n |
0 | 2 | 0.10 |
1 | 3 | 0.15 |
2 | 5 | 0.25 |
3 | 5 | 0.25 |
4 | 4 | 0.20 |
5 | 1 | 0.05 |
total | 20 | 1.00 |
3. The conclusion is not valid since the sample on which it was based was probably biased toward parents who would not have children again if they had the choice. No random sampling was involved. People wrote in because they wanted to and these people were likely to have strong feelings on the subject. The parents who enjoyed their families were not motivated to write in.
More complete solutions to many of the practice problems from the text can be found in Study Guide for Moore and McCabe's Introduction to the Practice of Statistics
(available in Math/Stats Learning Centre)
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