Organisation of Data Economics - Organisation of Data

Frequency of a variable is always:

In an ordered series, the data are:

A frequency distribution table showing value of sales in different columns and advertisement expenditure in different rows is termed as:

The number of observations falling within a class is called:

Statistical calculation in classified data is based on the lower class limit. (True/ False)

Class-intervals need to be mutually exclusive. (True/ False)

Height or weight of individuals are continuous variable as they can be fraction. (True/ False)

_______ series includes the upper limit of the class-interval.

______ series include the value of both the upper limit and lower limit itself.

________refers to number of times a given value appears in a distribution.

A mass of data in its original form is known as _______.

_____ is the process of arranging data in groups or classes on the basis of certain properties:

What is the difference between univariate and Bivariate frequency distribution?

Give an example of 'attribute'.

Why is the variable ‘population’ a time series?

Range is the average of the largest and the smallest observation. (True/ False).

Which values of a class are limits?

What is a class interval? How do the magnitude of the class interval and class limits get determined?

Do you agree that classified data is better than raw data? Why?

Give objectives of classification of data.

What are the general guidelines for the construction of a frequency distribution?

Prepare a frequency array of marks obtained by 25 students of a class in the Economics test:
20, 15, 20, 30, 40, 25, 25, 30, 40, 20, 35, 35, 50, 15, 50, 25, 40, 40, 30, 50, 25, 30, 30, 15, 45

Present the following table in the form of more than series:

Class Interval	Frequncy
10-20	12
20-30	13
30-40	18
40-50	13
50-60	12
60-70	9
70-80	8
80-90	1
Total	86

Distinguish between Absolute and relative frequencies.

Prepare ‘less than' and 'more than' cumulative frequency series:

Marks	0-10	10-20	20-30
No.of Student	4	6	10

What is ‘loss of information’ in classified data?

Prepare a bivariate frequency distribution for the marks by 24 examinees in Statistics and Accountancy.

Marks Marks
Statistics	Accountancy	Statistics	Accountancy
22	16	23	16
23	16	25	17
23	18	23	17
23	16	22	17
23	16	27	16
24	17	27	18
23	16	25	19
25	19	28	19
22	16	25	19
23	18	24	16
24	18	23	17
24	17	24	19

Direction Read the following case study table carefully and answer questions 1 to 5 on the basis of the same.

1. The above series is an example of ..... series.

1. Inclusive
2. Exclusive
3. Both (a) and (b)
4. Neither (a) nor (b)

2. The above situation shows which of the following types of presentation of data?

1. Chronological classification
2. Spatial classification
3. Qualitative classification
4. Quantitative classification

3. What is the percentage of students having weight more than 63 kgs?

1. 43.25%
2. 47.22%
3. 51.63%
4. 62.32%

4. How many students have weight less then 58 kgs?

1. 12
2. 15
3. 7
4. 10

5. Variable which doesn't take integral values is known as .....

1. Individual series
2. Discrete series
3. Continuous series
4. None of the above

From the following frequency distribution, prepare 'less than' and 'more than' cumulative frequency distribution.

Weges (In ₹)	100-110	100-120	120-130	130-140	140-150
Number of Workers	4	12	20	7	5

Direction Read the following case study and answer questions 1 to 5 on the basis of the same.
Collection of data is the first step in a statistical analysis. Data can be collected either from primary source or secondary source. Primary data is original as it is being collected for the first time. After collecting the data, next step is to organise the data as raw data cannot be used for further statistical analysis. There are various methods of classification of data based upon the nature of quantitative data.

1. Time series graphs are presented on the basis of general characteristics of a data. Choose from the options below.

1. True
2. False
3. Partially true
4. Incomplete statement

2. Classification of data based on time period is known as ......... classification.

1. Chronological
2. Temporal
3. Spatial
4. Both (a) and (b)

3. Data are grouped with reference to the attributes is referred to as ... classification.

1. Qualitative
2. Quantitative
3. Both (a) and (b)
4. Neither (a) nor (b)

4. In which of the following method of frequency distribution, the upper limit of each class is excluded from the series but equal to the lower limit of the succeeding series?

1. Continuous exclusive frequency distribution.
2. Continuous inclusive frequency distribution.
3. Continuous cumulative frequency distribution.
4. None of the above.

In a city 45 families were surveyed for the number of Cell phones they used. Prepare a frequency array based on their replies as recorded below.

1	3	2	2	2	2	1	2	1	2	2	3	3	3	3
3	3	2	3	2	2	6	1	6	2	1	5	1	5	3
2	4	2	7	4	2	4	3	4	2	0	3	1	4	3

Explain the ‘exclusive’ and ‘inclusive’ methods used in classification of data.