Collection of Data — Economics STD 11 Commerce — Question

Calculate coefficient of correlation between age group and rate of mortality from the following data:

Age group	0-20	20-40	40-60	60-80	80-100
Rate of mortality	350	280	540	760	900

An enquiry into the budgets of the middle class families in a certain city gave the following information:

Expenses on items	Food 35%	Fuel 10%	Clothing 20%	Rent 15%	Misc. 20%
Price (in ₹) in 2004	1500	250	750	300	400
Price (in ₹) in 1995	1400	200	500	200	250

What is the cost of living index during the year 2004 as compared with 1995?

Calculate weighted index number for 2018 by Weighted Aggregative Method and Weighted Average of Relative Method for the following data:

Item	Weight	Prices in 2017	Prices in 2018
A	10	100	161
B	7	200	210
C	15	50	60
D	9	20	30
E	10	10	14

How is the demand for a commodity affected by changes in the price of related goods? Explain with the help of diagrams.

Calculate quartile deviation and coefficient of quartile deviation from the data given below:
320, 400, 450, 530, 550, 580, 600, 610, 700, 780, 800

Calculate the index number for the period year 2008 to 2015, taking 2008 as base year:

Year (₹)	2008	2009	2010	2011	2012	2013	2014	2015
Price (₹)	75	50	65	60	72	90	75	70

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.

Draw a scatter diagram for:

1. Perfect positive correlation.
2. Perfect negative correlation.
3. Zero correlation.
4. Low positive correlation.
5. low negative correlation.
6. High positive correlation.

Write any four methods of collecting primary data Explain any one method along with its two merits and two demerits.