Population and Sampling MTH/231 Fahad M. Gohar Statistical data dates back to as early as Ancient Greek time‚ where it was introduced by John Graunt‚ William Petty and Pascal in the 16th century. It was then re-introduced by Gottfriend Achenwall in the 17th century. This was a very exciting time for scientists‚ astronomers and physicists alike as it raised the confidence and knowing that the laws of nature were not of divine intervention. As the years went on‚ new mathematical
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from a population is known as sample design. It describes various sampling techniques and sample size. It refers to the technique or procedure the researcher would adopt in selecting items for the sample. STEPS IN SAMPLE DESIGN Type of universe Sampling unit Source List Size of Sample Parameters of Interest Budgetary Constraint Sampling Procedure CRITERIA OF SELECTING A SAMPLING PROCEDURE Inappropriate sampling frame Defective measuring device Non-Respondents Indeterminancy
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Session 5 Topic: Sampling Theory/ Techniques and Discussions Project Brief ◦ Expectations and deliverables (Deadline October 1‚ 2010- EOD) Sampling basics ◦ Fundamental Issues ◦ Errors Sampling techniques ◦ Probabilistic ◦ Non-probabilistic Discussions © Krishanu Rakshit‚ IIM Calcutta 28 September‚ 2010 2 When do we use a ‘sample’ When do we use a census (population) Sampling errors ◦ Difference between a measure from sample and the measure
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Sullivan‚ BritneySullivan‚ Pg.1 Professor WeatherlySept.12‚ 2014 English 102 Essay #1 Through the eyes of a nine-teen year old teen in 1962 From the short story A&P‚ written by John Updike in 1962. Through Updike’s words‚ we visualize an ordinary day in the life of a 19 year old named Sammy. Who goes through difficulties on a daily basis‚ but finally gets up the nerve to challenge authority‚ (Lengel‚ his manager)‚ as well as himself. In this discussion‚ I reveal the many strifes Sammy
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When Familiar Is Not Better: 12-Month Old Infants Respond to Talk About Absent Objects In this experiment they hypothesize that it should be easier for infants to represent a hidden object when it is familiar than when it is new. They also hypothesized‚ the novelty preference hypothesis makes familiar toys less attractive and decreases infants’ motivation to reestablish contact with them and that leads to poor responsiveness. Another hypothesis‚ known as the location conflict hypothesis‚ was that
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Concept and basics of probability sampling methods One of the most important issues in researches is selecting an appropriate sample. Among sampling methods‚ probability sample are of much importance since most statistical tests fit on to this type of sampling method. Representativeness and generalize-ability will be achieved well with probable samples from a population‚ although the matter of low feasibility of a probable sampling method or high cost‚ don’t allow us to use it and shift us to the
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Twelve-year-olds are thinking of hanging out with friends‚ being in school‚ or just trying to be “cool”. Well not me. As a twelve year old my naive self was thinking of ways of making money so I could help my mom. I was lucky. Back in the Dominican Republic a friend of the family needed help with her daycare. She said that the job wasn’t hard and that she would make sure the person felt comfortable in the workplace. When I heard that‚ I thought “Bingo! This is exactly what I needed‚ easy work plus
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Thirteen year olds should be out with friends‚ fretting over who you’re going to the mall with‚ what color nail polish you plan on using‚ and who you are going to sit by at lunch tomorrow. Not how do I grow up and become an aunt in 9 months. I was not the 13 year old who could worry about her nails‚ friends‚ and lunch anymore. I was the 13 year old who had to face the harsh reality of growing up and deal with society. The phrase‚ "Your sister is pregnant"‚ played over and over again in my head‚ as
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Sampling Frame Advanced Cell technologies are constantly conducting hundreds of clinical trials in order to gain more knowledge on stem cell research. When dealing with the ethical barriers derived from stem cell research Advanced Cell Technologies spare no resources to maintain a healthy line so crossing of moral barriers occur. In order to conduct and proceed with research‚ a set of specific sampling frames must first be created. In statistics‚ a sampling frame is the source material or device
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Statistical Sampling Statistical Sampling 1. The authors of the paper make assumptions about the U.S. population on three dimensions. What are the three dimensions? (Hint: The authors refer to these dimensions as "components of change.") Answer: The three dimensions would be migration‚ fertility‚ and mortality. 2. What is the expected population of the U.S. in 2050 given the new series (i.e.‚ based on 1998 data) based on the lowest series? The middle series? And the highest
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