Sampling for Your Ph.D. Research

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Sampling for Ph.D. Research

In research terms, a sample is a group of people, objects, or items that are taken from a larger population for measurement. The sample should be representative of the population to ensure that we can generalize the findings from the research sample to the population. The selection of samples is decided, based on factors such as nature of the study, the size of the universe, the size of sample, degree of precision derived and availability of resources. The need of having a sample is very important because it would be impracticable to survey the whole population. In addition, the budget constraints prevent from surveying the entire population. Finally, the researcher must collect the results quickly because of time constraints.

Two general approaches to sampling are used in social science research. With probability sampling, all elements (e.g., persons, households) in the population have some opportunity of being included in the sample, and the mathematical probability that any one of them will be selected can be calculated.

With non-probability sampling, in contrast, population elements are selected based on their availability (e.g., because they volunteered) or because of the researcher's personal judgment that they are representative. The consequence is that an unknown portion of the population is excluded (e.g., those who did not volunteer).

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At Ph.D. Assistance, our experts help you to select appropriate sampling based on your research objective, chosen research design, data collection method, and target population. Whether you wanted to conduct probability or non-probability method of sampling, we help you to choose the right sampling.

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Ph.D. Experts have many years of experience in research methodology field in UK and US with profound knowledge of their disciplines and years of experience working with students of world-class Universities. We firmly believe working in the stress-free environment and make sure the same for all your students seeking our profession. Our in-depth knowledge of the research subject, meticulous planning, organizing and presentation Skills, 100% client commitment has always been handy in completing all our student’s research projects well ahead of the deadline.

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What are the services do we offer under Ph.D. writing?


Developed based on the relevant sources, a reasonable attempt at finding an area that warrant research & evidence of a bid to provide critical evaluation but mainly descriptive.


Wide range of sources, a clear identification of research gap in the literature along with aim and research questions (upgradable)


Refers to a wide range of seminal research with throughout engagement using latest resources. (upgradable)

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Sampling Features at Ph.D. Assistance

Several types of sampling techniques are available as follows:

Random Sampling:

This is the easiest form of probability technique. In this method, each respondent will get equal chances. However, if the target population is high, then it is very difficult to define the exact sample size (Saunders et al., 2003).

Systematic sampling:

This method is commonly referred as the Nth name selection method. In this method, each Nth record can be selected from the target population (Saunders, 2003).

Stratified sampling:

Based on the characteristics, the research will classify the research population. After that the participants will be selected by the researcher from (Saunders, 2003).

Convenience sampling:

In this method, a subset of participants will be selected by the researcher due to time and cost constrictions. This method often assumes that the target population is represented by the subset of the population. In this method, subjects with convenient accessibility are generally selected by the researcher (Saunders 2003).

Quota Sampling

Perhaps most commonly used in face-to-face interviewing. Interviewers on the street are usually looking for a specific type of respondent – age, gender are the most frequently used 'quota controls.' Quotas are given to interviewers and are organized so that the final sample is representative of the population. It is impossible to estimate the accuracy of the sample because it is not random.

Snowball Sampling:

This approach is often used when trying to interview hard to reach groups such as unemployed people or Black or Minority Ethnic residents. You initially contact a few potential respondents, interview them and then ask if they know of anybody else with the same characteristics you are looking for.


This technique is self-explanatory – respondents themselves decide whether to take part in the survey or not

Judgment sampling:

In this method, the subset will be selected by the researchers based on their judgment. This method is often preferred by researcher while evaluating the technical issues in sampling technique. The selected participants will be posted in the best position to achieve better solution (Saunders, 2003). The following table 5 shows the sampling method adopted by the researcher in this study:

To ensure that the chosen sample was an envoy of the complete statistically significant population it is essential to measure the size of the population. Sampling occupies any part of a target population or universe as a representative of that population or universe.

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Our well-designed process with fixed timeline & draft deliverables

Ph.D. Assistance has established a well-designed process and fixed timeline to complete the task. Our expert extremely meticulous on each element like what to include/exclude, purpose, structure, Discipline-specific sentence, and stylistic elements. Our research writing team is meticulously planned after taking into consideration the numerous tasks and resources involved in the different stages of your writing. After your confirmation with our admin team will appoint a dedicated subject expert from your research field. After that, we arrange a conference call or one-one discussion with an expert, to discuss the technicalities of the project, timeline, and deliverables.

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Service Features


1. What services do you offer under sampling services?
We provide a wide variety of sampling methods services such as Simple Random Sampling (SRS), Probability and non-probability sampling, Multistage Sampling, Systematic Sampling, Cluster Sampling and Stratified Sampling.
2. What are the qualifications of the writers you employ?
Only experienced and certified professionals are employed at our Ph.D. Assistance academic lab. All of our academic writers hold Master and Ph.D. degree and have at least 5 years of writing experience. Each academic writer has its own specialization; it helps to us to allocate the most appropriate writer according to your discipline. You will assure that you will get only subject matter expertise, i.e., every order of thesis providing only a relevant academic background. Please check for Ph.D. Dissertation writing work process below: After selecting a research topic, writers start working on the paper; Chapter wise send through the mail. After completing the work, the writer will format the paper according to your specification or latest university-specific guidelines. Then, the work is passed to Quality Assurance Department (QAD) and is meticulously checked for plagiarism. In additional, you will get the QAD report and plagiarism report**
3. Can I talk to my writer?
Yes, you can talk with our academicians through company Skype, mail, whats up chat messages and call. Indeed, you can directly communicate with the assigned writers after fixing an appointment with our project coordinators and arrange everything for you.
4. Is your pricing reasonable?
Pricing at Ph.D. Assistance is reasonable when compared to others, but the quality of writing is unmatchable. We also enable seasonal discount plan and referral offers for our clients. Please conduct our project coordinators for more details.
5. Do you charge any extra amount for revisions?
No. We are not charging extra amount for any revision of the document. We do any numbers of revisions until our customers get satisfied. To know more details about revisions and other inquiries. Please feel free to conduct our project coordinators or request a call back on the website to get the call back from experts. You may also please read our terms and conditions while placing an order.
6. Can I Learn How to Write a Dissertation at Ph.D. Assistance?
Of course, we will help you. If you are looking for the courses or online/onsite tutor to learn about how to write a dissertation, then contact us or Request call back. When you hire our services, we will assign you professionally and researcher who will help to teach or train you to break down each step of the dissertation writing into manageable sections.

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