题目
Descriptive statistics involves tabulating, depicting, and describing collections of data. These data may be either quantitative, such as measures of height, intelligence, or grade level—variables that are characterized by an underlying continuum or the data may represent qualitative variable, such as sex, college major, or personality type.
Large masses of data must generally undergo a process of summarization or reduction before they are comprehensible. Descriptive statistics is tool for describing or summarizing or reducing to comprehensible form. the properties of an otherwise unwieldy mass of data.
Inferential statistics is a formalized body of methods for solving another class of problems that present great difficulties for the unaided human mind. This general class of problems characteristically involves attempts to make predictions using a sample of observations. For example, a school superintendent wishes to determine the proportion of children in a large school system who come to school without breakfast, have been vaccinated for flu, or whatever. Having a little knowledge of statistics, the superintendent would know that it is unnecessary and inefficient to question each child; the proportion for the entire district could be estimated fairly accurately from a sample of as few as 100 children. Thus, the purpose of inferential statistics is to predict or estimate characteristics of a population from knowledge of the characteristics of only a sample of the population.
Which of the following are counting and describing associated with?
A.Descriptive statistics
B.Unknown variables
C.Qualitative changes
D.Inferential statistics
第1题
A.They cost less.
B.They tasted better.
C.They were in fashion.
D.They were widely advertised.
第2题
There are two kinds of computers (there), both (of them) are (widely) (used) today.
A.there
B.of them
C.widely
D.used
第3题
There are two kinds of computers (there), both (of them) are (widely) (used) today.
A.there
B.of them
C.widely
D.used
第4题
There are two kinds of computers there, both of them are widely used today.
A.there
B.them
C.widely
D.used
第5题
A.It combines the advantages of the other two styles.
B.The other two designs are more expensive to build.
C.It is the stage that most actors and directors prefer.
D.Many great plays were written for the thrust stage.
第6题
Which of the following statements is NOT true?
A.Many famous people in history were actually poor than the author.
B.Napoleon never had a refrigerator with glass door.
C.The rising and falling standard of living influences people's attitude towards their life.
D.After a century or two, the banker's fancy counter tops will also be worthless stuff.
第7题
A.The two boys were accused of killing a child about two years old.
B.The two boys were accused of lying.
C.The two boys were accused of kidnapping a young child.
D.The two boys were accused of premeditated murder.
第8题
The prime minister's __________ remarks were widely reported in the press.
A.profitable
B.predominate
C.primitive
D.provocative
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