A fantastic PPT on census and sample methods. The PPT includes a complete understanding of the meaning of census method and sample methods and its various methods of sampling. It also discusses about the types of errors, essentials of a good sample. It also discusses the difference between census and sample methods.
SAMPLING ; SAMPLING TECHNIQUES – RANDOM SAMPLING (SIMPLE RANDOM SAMPLING)Navya Jayakumar
SAMPLING ; SAMPLING TECHNIQUES – RANDOM SAMPLING
(SIMPLE RANDOM SAMPLING)
Sampling means the process of selecting a part of the population
A population is a group people that is studied in a research. These are the members of a town, a city, or a country.
It is difficult for a researcher to study the whole population due to limited resources
E.G.. Time, cost and energy
Hence the researcher selects a part of the population for his study, rather than selecting the whole population. This process is known as sampling
Also known as Random Sampling
A type of sampling where each member of the population has a known probability of being selected in the sample
When a population is highly homogeneous, its each member has a known chance of being selected in the sample
The extend of homogeneity of a population usually depends upon the nature of the research. E.g.: who are the target respondents of the research
A fantastic PPT on census and sample methods. The PPT includes a complete understanding of the meaning of census method and sample methods and its various methods of sampling. It also discusses about the types of errors, essentials of a good sample. It also discusses the difference between census and sample methods.
SAMPLING ; SAMPLING TECHNIQUES – RANDOM SAMPLING (SIMPLE RANDOM SAMPLING)Navya Jayakumar
SAMPLING ; SAMPLING TECHNIQUES – RANDOM SAMPLING
(SIMPLE RANDOM SAMPLING)
Sampling means the process of selecting a part of the population
A population is a group people that is studied in a research. These are the members of a town, a city, or a country.
It is difficult for a researcher to study the whole population due to limited resources
E.G.. Time, cost and energy
Hence the researcher selects a part of the population for his study, rather than selecting the whole population. This process is known as sampling
Also known as Random Sampling
A type of sampling where each member of the population has a known probability of being selected in the sample
When a population is highly homogeneous, its each member has a known chance of being selected in the sample
The extend of homogeneity of a population usually depends upon the nature of the research. E.g.: who are the target respondents of the research
Basic Terminologies
Population
Sample and Sampling
Advantages & Disadvantages of Sampling
Probability Sampling
Types of Probability sampling
Non-Probability Sampling
Types of Non-probability sampling
Basic Terminologies
Population
Sample and Sampling
Advantages & Disadvantages of Sampling
Probability Sampling
Types of Probability sampling
Non-Probability Sampling
Types of Non-probability sampling
Population in statistics means the whole of the information which comes under the preview of statistical investigation.
In other words, an aggregate of objects animate or in animate under study is the population.
It is also known as “Universe”.
Sampling and different ways of sampling under public opinion and survey research.Advantages and disadvantages of different sampling methods with pictures and examples.
The Art Pastor's Guide to Sabbath | Steve ThomasonSteve Thomason
What is the purpose of the Sabbath Law in the Torah. It is interesting to compare how the context of the law shifts from Exodus to Deuteronomy. Who gets to rest, and why?
This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
Impact of Ethnobotany in traditional medicine,
New development in herbals,
Bio-prospecting tools for drug discovery,
Role of Ethnopharmacology in drug evaluation,
Reverse Pharmacology.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
Palestine last event orientationfvgnh .pptxRaedMohamed3
An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
2. In November 1988, George Bush was elected president
of the US with 54% of the popular vote as against 46%
for Michael Dukahis.
Prior to the election, a number of political polls had
predicted the Bush victory.
Bush Dukahis
CBS/New York Times 57 43
ABC/Washintong Post 56 44
Gallop Poll 56 44
Gordon Black/USA Today/CNN 55 45
KRC/APN 55 45
Harris Poll 53 47
NBC/Wall Street Journal 53 47
3. Although the poll estimates were varied, you
can see how they were clustered around the
actual election-day results (54%, 46%).
Ques. Now how many interviews do you suppose
it took each of these pollsters to come with a
few % points in estimating the behaviour of
about a 100 million voters?
Ans. Fewer than 2000
4. The level of accuracy in due to the fact that, the
sample population provided useful
descriptions of the total population and did
contain essentially, the same variations that
exist in the population.......This is what
sampling is all about.
Sampling is the process of selecting
observations. In order words, it is selecting a
part to represent a whole.
5. • Sampling allows researchers to draw precise inferences
on all the units (a set) base on relatively small number
of units (a subset) when the subsets accurately
represent the relevant attributes of the whole set.
• Is associated with coverage and scale of a survey.
Rationale
i. Saves money – although unit cost of total coverage will
be lower
ii. Saves labour
iii. Saves time.
6. Element – an element is that unit about which
information is collected and that provides the basis
of analysis. It can be people or certain types of
people, families, social clubs or company.
NB. Elements and units of analysis are often the same
in a given study, though the former refers to
sample selection and the latter refers to data
analysis.
Population – It is aggregation of study elements. In
other words it is the entire set of relevant units or
cases or individuals that fit a certain specification
e.g. hhs,, hs, teachers, students etc.
7. Study population – Is that aggregation of elements
from which the sample is actually selected.
Sampling Unit – Is that element or set of elements
considered for selection in some stage of sampling.
In a simple-stage sample, the sampling unit are the
same as the elements. In a more complex samples,
different levels of sampling units may be
employed e.g Census blocks in a city – selection of
sample households in the selected blocks –
selection of sample of adults from the selected
households.
8. Sample Frame – Is the actual list of sampling
units from which the sample is selected. In a
single-stage sampling design, the sample frame
is simply a list of the study population e.g.
Student roster could be the sample frame when
students are selected from it. If available, its
reliability has to be assessed – updating.
9. Limitations of Sample Frame:
• Incomplete frames - when some units are missing
• Cluster elements - when samples are listed in
clusters rather than individuals. Individual
clusters must be listed.
• Blank foreign elements – when some of the units
are not included in the research population e.g.
Non-students in a youth list – new settlers, Error in
sampling Frame – 1936 Us Election.
10. Observation Unit – An observation unit or unit of
data collection is an element or aggregation of
elements from which information is collected.
The unit of analysis and unit of observation are
often the same, but they need not be the same
always. For example, a researcher may interview
heads of households (observation units) to collect
information about all members of the households
(the unit of analysis).
11. Sample size - the selected number of the
population to be surveyed. How is this
determined?
Sample fraction - Sample size expressed as a
ratio of the frame.
Sample randomness - distribution – spread of
sample size
12. There are two types of sampling methods –
Probability and Non-probability sampling methods.
Probability Sampling
The ultimate purpose of sampling is to select a set of
elements from a population in such a way that
descriptions of these elements accurately portray the
parameters of the total population from which the
elements are selected.
Probability sampling enhances the likelihood of
accomplishing this aim and also provides methods for
estimating the degree of probable success.
13. • Random selection is the key to this process.
• In a random selection, each element has an
equal chance of selection independent of any
other event in the selection process.
• Mean of the sample population will be close to
the mean of the total population.
• The bigger the sample, the closer the sample
mean to the total population mean.
14. Types of Probability Sampling
1. Simple random – it is the basic probability design and is
incorporated in almost all elaborate sample design. It is a process
by which each member of the sample population has an equal
chance or known non-zero chance of being selected.
Procedure
Identification number must be given to every unit on member of
the population.
a) Lottery Approach
b) Use of random tables
Is applicable when a sample frame can be secured or compiled.
15. 2. Systematic sampling – every Kth
element in the total list is chosen
systematically for inclusion in the sample. The first element is
selected by simple random process.
3. Stratified sampling – This method is not an alternative to the
simple random and systematic sampling methods but it represents
a possible modification in their use. Stratified sampling ensures a
greater degree of representativeness – thereby reducing the
probable sampling error.
- disaggregating of the population into coherent sub-groups so
that the sample becomes more representative.
- ensures that different groups of population are adequately
represented in the sample.
- it combines homogeneity and heterogeneity at different levels
16. 4. Cluster sampling - It is often used in large surveys
because it is not very expensive. It involves selecting
larger grouping called clusters from which the
sampling units are chosen.
Different categories or levels
• Major – states, regions, districts, cities
• Medium – village, town, NB. Etc
• Compound housed, classes
- Used in situations where no reliable sample frame
exist
- Can be used to estimate population when census
data are not available
17. 5. Multi-stage Sampling - Sub – Sampling in
stages – combination of sampling techniques
E.g. choosing about 1000 farmers for a study
Region, Districts then to individuals.
18. Even though no probability sample will be perfectly
representative in all respect, controlled selection
methods permit the researcher to estimate the degree
of expected error in that regard.
In spite of the above comment, it is sometimes not
possible to use standard probability sample methods or
sometimes, it may be even appropriate to use non-
probability sampling methods.
19. 1. Purposive or Judgemental Sampling
• The use of purposive sampling is heavily dependent on the
subjective decision of the researcher.
• Samples are selected because they satisfy certain criteria of
interest. choice of informants/people with necessary information
or knowledge or experience e.g.
- Mining & AIDS
- Ethnic conflict
- Disaster
• This method is very cheap.
• In spite of the subjectiveness of this approach in the selection of
units, social scientist have used it with very good success.
20. 2. Accidental Sampling
• This method is also known as “Convenience
Sample”.
• It includes selecting anyone who is handy – i.e.
anyone the interviewer meets on the street.
- Interviewers are influenced by a lot of factors in
choosing the sample.
- Researcher must be aware of biases
21. 3. Quota sampling
• This method is an improvement over Accidental
sampling. The main objective is to select a sample that
is similar as much as possible to the sampling
population.
• Certain parameters and characteristics are defined for
interviewers - Sex, age, ethnicity, education, etc.
- Interviewers are however, not told precisely who to
interview
- Although certain categories are defined, they are not
necessarily proportional.
22. Problems associated with Quota Sampling
• Lack of information on which to base the quota
• Small number of variables can be used in quota - not all
characteristics are visible e.g. social classes in Africa.
• Unavailability of certain segments of the population -
e.g. sick and confined.
• Difficult to supervise
- More useful in a situation where a small sample is
taken from a large population.
- Be careful to generalise - check the representativeness.