單項選擇題在數(shù)據(jù)采集活動中，進行觀測記錄的單位與總體中的個體（）

A.必須相同
B.必須不同
C.可以相同，也可以不同
D.完全沒有關(guān)系


您可能感興趣的試卷

你可能感興趣的試題

2.單項選擇題The number of class intervals in a frequency distribution is usually between （）.

A.3 and 5
B.7 and 9
C.5 and 15
D.1 and 25

3.單項選擇題If data are grouped into intervals and the number of items in each group is listed, this could be called a （）

A.ogive
B.histogram
C.frequency distribution
D.stem and leaf plot

5.單項選擇題品合格率指標是（）

A.比例相對指標
B.結(jié)構(gòu)相對指標
C.比較相對指標
D.強度相對指標

6.單項選擇題Which of the following statements is not true？（）

A.One form of descriptive statistics uses graphical techniques
B.One form of descriptive statistics uses numerical techniques
C.In the language of statistics，the term population refers to a group of people
D.Statistical inference is used to draw conclusions or inferences about characteristics of populations based on sample data

7.單項選擇題One rule that must always be followed in constructing frequency distributions is that （）.

A.the number of classes must be less than 10
B.each data point can only fall into one class
C.the width of each class is equal to the range
D.the number of intervals must be an odd number

8.單項選擇題最能反映離散程度的指標是（）

A.全距
B.標準差
C.平均差
D.標準差系數(shù)

9.單項選擇題One advantage of a stem and leaf plot over a frequency distribution is that （）.

A.it contains more class intervals
B.the values of the original data are retained
C.the class midpoints are used as the stem
D.the class midpoints are used as the leaf

10.多項選擇題某班的學習按考試成績分為60分以下，60-70，70-80，80-90，90-100，這種分組（）

A.是等距分組
B.第一組假定下限是0
C.相鄰組限是重疊的
D.分組標志為連續(xù)型變量
E.某學生的成績80分應歸在70-80這一組