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The data were collected via telephone with 1,000 radio listeners using random-digit dialing.Cicarelli chose telephone interviewing because previous research has shown that nearly 100 percent of radio listeners have telephones, and it is faster than mail surveys.The sampling plan utilized by cicarelli is called an sample.
We are a large-scale joint-stock enterprise integrating scientific research, production and sales.Our leading products have crushing equipment, sand making equipment, mobile crusher, etc., Each type of product is with complete specifications. All products have passed ISO9001, CE and GOST international quality system certification.