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

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

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

A.an ogive
B.a histogram
C.a frequency polygon
D.a stem and leaf plot

A.midpoint frequency
B.cumulative frequency
C.stem and leaf plot
D.relative frequency

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

A.Summarising data
B.Displaying aspects of the collected data
C.Reporting numerical findings
D.Estimating characteristics of the population

A.descriptive statistics
B.inferential statistics
C.nonparametric statistics
D.wishful thinking

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

A.organising data.
B.summarising data
C.presenting data in a convenient and informative way
D.doing all of the above

A.population
B.sample
C.parameter
D.statistic