Thinking and practice
(A) 1 data file contains the following data, five households do not have cars (coded as 0), 20 households have a car (encoded CD 1), 10 families have two cars (coded as 2) indicate which of the following statistics applicable to describe the data and calculates the statistic value.
A congregation has a number of B. The median number of cars has a number of car
C. has a number of car variance coefficient of variation D.
(B) 2. In order to generate a sum of a given variable. Which summary statistics should be used?
A.mean B.sum C.median D.mode
(B) 3. If the data is shown in FIG 3/45, if necessary to obtain the mean ABC these three variables, and missing in the desired value, using the information determined from existing data as mean . Select function which can meet the requirements in spss
A. mean（abc） B.mean.2（abc）
C.mean2（abc） D.（a+b+c）/3
4. In the graphics menu, re-made section 3.6 statistical graphics. Compare similarities and differences between these two methods to draw statistical graphs.
5. indicators pointing out the differences, advantages and disadvantages of the mean, mode, median three describe the data center trend
Metrics are the main trends in the data center. The mean value affects vulnerable to extreme
The mode of reaction of the central tendency of this set of observations, free from the influence of extreme values
The median less affected by extreme values, in very small or great data, the mean and median are often more representative of the central tendency of the data.
6. Explain the difference stems and histograms, if you want to show information of the original data as much as possible, what kind of graphics should be used?
FIG stem quantitative variables describing a graphical manner, it is possible in addition to the information given by the distribution histogram out, it is possible to restore most of the original information data
Figure stems and leaves should be selected
7 illustrates a histogram difference and Pareto charts.
Pareto chart is a bar chart formed after a rectangular special section in descending order of the bar, the left most rectangle
Histogram can be visually observed data distribution.
8. indicate which measure of central tendency is used to describe the following attributes, if there are two or more indicators can, please indicate which indicators may reflect the most amount of information?
A. The number of sisters and brothers. (The mode, median, mean)
B. driving the car type (the mode)
C. father's body weight (mean, median)
D. Number (mean, median, mode) vacation days per year
9. For the question on four variables, respectively, which may be described by the following chart
A bar, Pareto
B bar charts, Pareto
C Histogram
10. The management of a company's minority employees have particularly high wages, most of the staff to take low wages. If you represent a company bosses and employees to negotiate a raise, then you tend to use a statistical indicators which explain the low wages? (The mode) and if you are the boss, which you tend to use a statistical indicator to illustrate the wages of workers is already high? (Mean)
11. FIG tank can detect outliers in the data. DisRese sav data descriptive statistical analysis, whether there is an abnormal value by analyzing the data in the box in FIG.