11th class statistics important definitons for chapter 1 and chapter 2 and short questions|| 1st year class statistics

 Here you can see the important definitions of chapter 1 and 2 combine,because i think chapter 1 and chapter 2 definitions will remain better as compare to one is first and second is last.

11th class statistics important definitons  for chapter 1 and  chapter 2 and short questions|| 1st year class statistics 

chapter 1 : Introduction to statistics

chapter 2: Representation of data

     

(IMPORTANT   SHORT QUESTIONS) CHAPTER # 1& 2

 

QUESTIONS	ANSWERS
1.       Define Secondary Data.	The data on which statistical treatment is applied at least once is called secondary data.e.g  Grouped Data.
2.       What is Qualitative Variable?	The characteristic that varies only in quality is called Qualitative Variable.e.g,eyecolour,haircolour,caste etc.
3.       What is Sample?	Any represantative part of a population is called a sample.e.gSample of urban students taken from all college students.
4.       What is Tabulation?	Tabulation is the systematic arrangement of the statistical data in columns or rows.
5.       What is Class Limit?	The lower and upper limits of a class interval are known as Class Limits.
6.       What do you mean by Grouped Data?	A tabular arrangment of data into different  groups with their corresponding  frequencies is called Grouped Data.
7.       What are the two branches of Statistics	(i)Descriptive Statistics (ii)Inferential Statistics
8.       What is a variable?	The characteristics that may change from individual to individual is called variable.e.g   Age, Heigt,Weight etc.
9.       What is classification?	The process of arranging things in groups or classes according to their resemblances is called classification.OR The process of arranging data into classes or categories according to some common characteristics present in the data is called classification.”
10.   Define histogram.	The set of adjacent rectangles is called histogram which is constructed by taking class boundaries on x-axis and frequencies on y-axis.
11.   Name the two parts of statistical table.	(i)Head Note(ii) Foot Note
12.   What is primary data?	The data on which any statistical treatment is not applied is called Primary Data.e.g Cartoons, postcards, posters Map, photographs, films, First-hand newspaper and magazine, accounts of events etc.
13.   What is a statistic?	The numerical quantity calculated from sample is called statistic.e.g Sample mean, Sample median, Sample mode etc.
14.   Define class Mark?	The average of upper and lower class limits is called Class Marks.e.g for class limit 20-30, the class mark=(20+30)/2
15.   What is a Pie chart?	A type of graph in which a circle is divided into sectors that each sector represents a proportion of the whole.
16.   Define data.	The collection of raw figures and facts is called data.e.g the data of Primary Schools in every District of Punjab.
17.   What does ∑ denote for?	∑ denotes for Summation.
18.   What is presentation?	A speech or talk in which a new product, idea, or piece of work is shown and explained to an audience. And presentation of data means conversion of Primary Data into an organised form.
19.   Define class boundaries.	Class boundaries are the precise numbers which separate one class from another.e.g.  20-40,40-50,50-60,60-70 etc.
20.   What is chart?	A chart is a graphical representation of data, in which "the data is represented by symbols, such as bars in a bar chart, lines in a line chart, or slices in a pie chart".
21.   Define statistics in plural sense	The word statistics, when used in plural senses means numerical facts collected in any field of study by using a statistical method.
22.   Define continuous variable giving example	A variable which can assume any value within a given range is called a continuous variable. For e.g. age of persons, speed of car etc.
23.   Differentiate between variable and constant	The difference between variables and constants is that variables can change their value at any time but constants can never change their value.
24.   Differentiate between histogram and Historigram	Histogram is the graph of frequency distribution while the Historigram is the Graph of Time series data.
25.   Differentiate between classification and tabulation	The process of condensation of the data for convenience is called tabulation,whileThe process of dividing the data into different homogeneous groups is claaed classification.
26.   What do you meant  by statistical method?	Statistical method includes all the rules of procedure and techniques which are used in the collection, classification, tabulation, comparison and interpretation of data.
27.   Define constant with an example.	The charcteristic that does not vary is called constant.e.g size of a car, no. of days in a week.
28.   What is questionnaire?	A set of printed or written questions with a choice of answers, devised for the purposes of a survey or statistical study.
29.   Define ‘Class Interval’.	The size of each class into which a range of a variable is divided
30.   Write names of the types of diagrams.	i.            One dimensional diagrams ii.             Two-dimensional diagrams iii.             Three dimensional diagrams iv.             Pictograms or Ideographs v.             Cartographs or Statistical maps
31.   Differentiate between sample and population.	Population is the Whole or Agregate about which we are concern while Sample is any representative part of the Population.
32.   Write the sources to collect secondary data.	Private Source,Semi – Official Source,Official Source,
33.   Name at least four parts of a table.	(i)The title(ii)The stub(iii)The box head(iv)The body (v)Prefatory note (vi)Foot note (vii)Source note
34.   What is frequency distribution?	The organization of raw data in table form with classes and corresponding frequencies is called Frequency Distribution.OR  A representation of data, either in a tabular format, which displays the number of observations within a given interval.
35.   Differentiate between summation operator and product operator.	Summation operator”∑” mean total of values while Product operator”∏” Product of values.
36.   What is statistics?	The science of collection ,presentation ,interpretation and analysis of numerical data is called “Statistics”.
37.   What is Constant and Variable?	The characteristic that may change from invidual to individual is called variable.e.g  age of persons, While The characteristic that does not change is called constant.e.g π.
38.   What is meant by grouped data?	Data which have been arranged in groups or classes rather than showing all the original figures.ORA raw dataset can be organized by constructing a table showing the frequency distribution of the variable is called grouped data.

 

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