Question

need problems 1-10

Chapter Quick Quiz 1. When one is constructing a table representing the frequency distribution of weights (b) discarded textile items from Data Set 23 in Appendix B, the first two classes of a frequen distribution are 0.00-0.99 and 1.00-1.99. What is the class width? 2. Using the same first two classes from Exercise 1, identify the class boundaries of the first class 3. The first class described in Exercise 1 has a frequency of 51. If you know only the class limits given in Exercise 1 and the frequency of 51, can you identify the original 51 data values? 4. A stemplot is created from the intervals (min) between eruptions of the Old Faithful geysen nowstone National Park, and one row of that stemplot is 6 1222279. Identify the ues represented by that row. 5. In the California Daily 4 lottery, four digits between 0 and 9 inclusive are randomly se lected each day. We normally expect that each of the ten different digits will occur about 1/10 of the time, and an analysis of last year's results shows that this ciid uppen. Because the results are what we normally expect, is it correct to say that the sub of selected digits is a normal distribution? 6. In an investigation of the travel costs of college students, which of the following does not belong: center; variation; distribution; bar graph: oudies: change parterns over time? 7. In an investigation of the relationship between SAT scores and grade point averages (GPA) of college students, which of the following graphs is most helpful: histogram: pie chart; scat- terplot; stemplot; dotplot? 8. As a quality control manager at Sony, you find that defective CDs have various causes, in cluding worn machinery, human error, bad supplies, and packaging mistreatment. Which of the following graphs would be best for describing the causes of defects: histogram: scatterplots Pareto chart; dotplot; pie chart? 9. What characteristic of a data set can be better understood by constructing a histogram! 10. A histogram is to be constructed from the brain sizes listed in Data Set 6 of Appendix B. Without actually constructing that histogram, simply identify two key features of the histo- gram that would suggest that the data have a normal distribution.

Answer 1

1) Class width is 0.99

2) as the given information in the question is concerned

Class boundary = lower limit of the concerned class + upper limit of the previous class / 2

= (0.99+1) / 2 = 1.99/2

= 0.995

8) Pareto chart should be used by quality control manager.

9) better understanding of the data set by histogram are

a) it is use for continuous quantitative data.

b) histogram (a visual representation of data) is a competent tool to analyzing the whole data set.

c) help in to get the outliers and without going through the set of data.