CHAPTER 7—SAMPLING AND SAMPLING DISTRIBUTIONS MULTIPLE CHOICE 1. From a group of 12 students‚ we want to select a random sample of 4 students to serve on a university committee. How many different random samples of 4 students can be selected? a.|48| b.|20‚736| c.|16| d.|495| ANS: D 2. Parameters are a.|numerical characteristics of a sample| b.|numerical characteristics of a population| c.|the averages taken from a sample| d.|numerical characteristics of either a sample or a population| ANS:
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light energy from the sun to make their own food (photosynthesise). Sampling plants 1. RANDOM SAMPLING Random sampling is usually carried out when the area under study is fairly uniform‚ very large‚ and or there is limited time available. When using random sampling techniques‚ large numbers of samples/records are taken from different positions within the habitat. A quadrat frame is most often used for this type of sampling. The frame is placed on the ground (or on whatever is being investigated)
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SAMPLING Sampling is the act‚ process‚ or technique of selecting a suitable sample‚ or a representative part of a population for the purpose of determining parameters or characteristics of the whole population. REASONS FOR SAMPLING There are six main reasons for sampling instead of doing a census. These are; * Economy * Timeliness * The large size of many populations * Inaccessibility of some of the population * Destructiveness of the observation * Accuracy or Reliability
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Application of sampling distribution Joe Greene‚ a new manager at Pilgrim Bank wants to better understand profitability data for bank’s customers. Joe is able to obtain a random sample of 31‚634 customers on the following variables – Profitability (in $‚ for the most recent completed year‚ i.e. 2006)‚ whether or not the customer uses the online banking channel‚ customer tenure‚ age and income where available‚ as well as the customer’s residential area. Descriptive statistics for Profits indicates
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CHAPTER 12 SAMPLING MECHANICS Sampling is an activity that involves the selection of individual people‚ data or things‚ from a target population/universe. A population‚ or universe‚ is the entire set people data or things that is the subject of exploration. A census involves obtaining information‚ not from a sample‚ but rather from the entire population or universe. A sample (as opposed sampling) is a subset of the population/universe. For Marketing Research purposes‚ sampling usually
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Surf Excel‚ launched in 1954‚ is one of the oldest detergent powders in India and Pakistan. Initially‚ the brand was positioned on the clean proposition of “washes whitest”. However‚ with the emergence of numerous local detergent manufacturers and the entry of other global brands‚ Surf Excel underwent various changes in its Brand Communication; from ’lalitaji’ to ’dhoondte reh jaaoge’ to ’jaise bhi daag ho‚ surf excel hai na’‚ and is today communicated on the platform of ’Dhaag achcha hai’. This
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SAMPLING TECHINIQUE PROBABILITY SAMPLING Having chosen a suitable sampling frame and established the actual sample size required‚ you need to select the most appropriate sampling technique to obtain a representative sample. The basic principle of probability sampling is that elements are randomly selected in a population. This ensures that bias is avoided in the identification of the elements. It is an efficient method of selecting elements which may have varied characteristics‚ as the process
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THE USE OF CLUSTER SAMPLING TO SELECT A REPRESENTATIVE SAMPLE: STUDENT RECRUITMENT MARKETING IN SOUTH AFRICA – AN EXPLORATORY STUDY INTO THE ADOPTION OF A RELATIONSHIP ORIENTATION Submitted by: Tutorial group: Due date: 14 September 2013 TABLE OF CONTENTS 1 INTRODUCTION 1 2 CLUSTER SAMPLING 2 2.1 ADVANTAGES OF CLUSTER SAMPLING 3 2.2 DISADVANTAGES OF CLUSTER SAMPLING 3 3 USE OF CLUSTER SAMPLING IN A RECENT MARKETING RESEARCH STUDY 3 3.1 ADVANTAGES OF
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Acceptance Sampling Acceptance sampling has traditionally been a partner of statistical process control and control charts in the area of statistical quality control. Products are shipped around in batches or lots‚ and the idea behind acceptance sampling is that a batch can be declared to be satisfactory or unsatisfactory on the basis of the number of defective items found within a random sample of items from the batch. Thus acceptance sampling provides a general check on the “quality” of the items
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Work sampling is a systematic assessment effort across early childhood programs for children three years of age through the sixth grade. In Pennsylvania work sampling is used in PA PreK Counts‚ Infant/toddler and preschool early intervention‚ star 3 and 4 childcare centers and more. Assessments that are gathered are used to answer questions about children’s learning‚ knowledge‚ progress‚ skills and interests. There are many different types of assessments such as; screening tools‚ diagnostic tests
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