MATH 221 STATISTICS FOR DECISION MAKING WEEK 1 HOMEWORK / 2020
DeVry MATH 221 Week 1 Homework Answers (2020)
1. The average age of all employees at a local store would be considered a:
2. A survey of 1050 students was taken from a university with 19,500 students. The 19,500 would be considered a:
3. The average age of students in a statistics class is 28 years. The 28 years would be considered an example of:
4. The ages of 20 first graders would be considered:
5. If a data set included the color of cars in a parking lot, those data would be considered:
6. The final grades for students in a statistics class would be considered:
7. Every fifth person boarding a plane is asked additional security questions. This sampling technique is called:
8. A personnel director at a large company would like to determine whether the company cafeteria is widely used by employees. She calls each employee and asks them whether they usually bring their own lunch, eat at the company cafeteria, or go out for lunch. This study design would be considered:
9. Which of the following would be the mean of this data set: 5, 7, 12, 36, 14, 12, 33, 21
10. Which of the following would be the standard deviation of this sample data set: 67, 54, 30, 77, 92, 41, 75, 81
11. Which of the following would be the variance of this population data set: 3, 9, 8, 9, 4, 5, 7, 11, 9, 7, 5, 4, 3, 1
12. The difference between cluster sampling and stratified sampling would be:
13. If data set A has a smaller standard deviation than data set B, what would be different about their distributions?
14. In a normally distributed data set a mean of 55 where 99.7% of the data fall between 47.5 and 62.5, what would be the standard deviation of that data set?
15. Which of the following data sets would you expect to have the highest standard deviation?
16. Which data outcome of the speed of cars would best support installing a speed bump?
17. In manufacturing, systematic sampling could be used to determine if the machines are operating correctly. Which of the following best describes this type of sampling?
18. A graph shows a number line with a mark for each data value in the data set above its value. This graphic is most likely to be:
19. Match the terms and their definitions
20. Match the terms and their definitions
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