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2.4 Which of the following sampling methods require a sampling frame ? (i) Random (ii) Stratified (iii) Quota (iv) Systematic
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2.3 Which of the following stastements are not true ? I If a sample is selected using random sampling, it will be free from bias. II A sampling frame is a numbered list of all items in a sample. III In cluster sampling there is very little potential for bias. IV In quota sampling, investigators are told to interview all the people they meet up to a certain quota.
2.2 The following statements relate to different types of data (i) Secondary data are data collected especially for a specific purpose (ii) Discrete data can take on any value (iii) Qualitative data are data that cannot be measured (iv) Population data are data arising as a result of investigating a group of people or objects Which of the statements are true ?
2.1 Which of the following is/are primary sources of data ? (i) Historical records of transport costs to be used to prepare forecasts for budgetary planning (ii) The Annual Abstract of Statistics, published by the Office for National Statistics in the United Kingdom(iii) Data collected by a bank in a telephone survey to monitor the effectivess of the bank’s customer services
6.5 The annual demand for an item of inventory is 2,500 units. The cost of placing an order is $80 and the cost of holding an item in stock for one year is $15. What is the econmic order quantity, to the nearest unit ?
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