1) To obtain information by a daily newspaper regarding market prices of goods.
2) To obtain information about the sales of a text book in the market.
3) To analyse the reaction of budget for 2012-13 by the government.
Which method is suitable to collect the data and .why ?

Prateek,

1. To obtain information by a daily newspaper regarding market prices of goods, one can go for published secondary data.
2. To obtain information about the sale of a textbook in the market, one can go for Direct Personal Investigation. The researcher can directly go to each seller of that book and collect the information regarding the sale of book. 
3. To analyse the reaction of the budget of the general public, one can go for the method- Information through Questionnaire and Schedules. The investigator can prepare a questionnaire that comprise of a list of relevant questions. 

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