We use cookies to give you the best experience possible. By continuing we’ll assume you’re on board with our cookie policy

# Inferential Statistics and Introductory to Operations Essay Sample

The whole doc is available only for registered users OPEN DOC

Get Access

## Inferential Statistics and Introductory to Operations Essay Sample

A population consists of all the possible observations of the random variable under study. A census involves the gathering of data on a random variable from every member of the target population A sample is a subset of all members of a target population. Sampling is the process of selecting a representative subset of observations from a population to determine the characteristics of the random variable under study.

SAMPLING METHODS

Two methods of sampling are:
1 2

probability sampling methods non-probability sampling methods

PROBABILITY SAMPLING

In probability sampling (random-based sampling) every member of the target population has a chance of being selected for the sample. Sampling units are selected from the target population on a random basis. There are four probability-based sampling methods: 1 2 3 4

simple random sampling systematic random sampling stratiﬁed random sampling cluster random sampling.

PROBABILITY SAMPLING

Simple random sampling: Each member in the entire population has an equal chance of being selected. Systematic random sampling: Sampling begins by randomly selecting the ﬁrst sampling unit from the sampling frame (database of population members). Thereafter, subsequent sampling units are selected at a uniform interval relative to the ﬁrst sampling unit. Stratiﬁed random sampling: This method is used when the population is heterogeneous with respect to the random variable under study. The entire population can be divided into segments (or strata) where the sampling units in each stratum are relatively homogeneous. Thereafter, random samples are selected from each stratum.

PROBABILITY SAMPLING:

Cluster random sampling: The entire population is divided into clusters, and a random sample of these clusters are selected. The sampling units are selected from these randomly selected clusters.

NON-PROBABILITY (NON-RANDOM) SAMPLING:

In non-probability sampling sample members are not selected randomly, the main selection criteria are the personal judgement of the researcher and/or convenience. There are four types of non-probability based sampling methods: 1 2 3 4

Convenience sampling Judgement sampling Quota sampling Snowball sampling

NON-PROBABILITY SAMPLING:

Convenience sampling: This method is used when the sampling units are selected to suit the convenience of the researcher. Judgement sampling: Personal judgement is used by the researcher to select the best sampling units to include in the sample. Quota sampling: The population is divided into segments and a quota of sampling units is selected from each segment. Snowball sampling: Snowball sampling is used to reach target populations
where the sampling units are diﬃcult to contact.

We can write a custom essay

Order an essay

## You May Also Find These Documents Helpful

The world of feminist research

In the world of feminist research, there is a diversity of issues that can be studied, many of which are sensitive topics. An issue I chose to focus my research on is female genital mutilation (FGM). I have found that more research needs to be conducted on FGM, and it should be done in a way that respects the rights of the individuals and the...

Understand how to organise and evaluate data...

1.1. Describe purpose and benefits of organising data so that it can be analysed. Data can be organised in many ways, and is normally specific to the person organising it. The benefits to this are to make the data far easier to understand and work with making it a lot more meaningful. This could be through the use of filters or by simply removing unnecessary...

Investigate the different variables in Meringue

Task Analysis: To be able to investigate and answer the task I will have to carry out some background research on: what ingredients make up Meringue, especially what different sugars are used, generally. I will use my knowledge which I have obtained from Year 10 about Meringue’s and apply it to the research I do in addition to this I will have to research different...

The company background, significance of study and...

In this chapter the researcher explores, the company background, the background of the study, statement of the problem, research questions, research objectives, limitation and delimitation of the research, significance of study and definition of terms. 1.1 Background to the study At independence in 1980 the Zimbabwe Oil Procurement Consortium (ZOPCO) a consortium of companies, which had taken over Genta was responsible for the procurement of...

Research Methods

Methodology, in its simplest form, refers to how the research should be undertaken (Saunders et al. 2009). In a practical way, it is a function of research question(s), study approach, scale of the study, type of data, sample size and participants, data analyses techniques and study limitations (Johnson and Waterfield, 2004). Accordingly, this chapter is divided into nine sections. Section 3.1 explains the reasons for...

### Essays 57,473

300+
Materials Daily
100,000+ Subjects
2000+ Topics
Free Plagiarism
Checker
All Materials
are Cataloged Well

Sorry, but copying text is forbidden on this website. If you need this or any other sample, we can send it to you via email.

Sorry, but only registered users have full access

immediately?

Become a member

Thank You A Lot!

Emma Taylor

online

Hi there!
Would you like to get such a paper?
How about getting a customized one?

Couldn't Find What You Looking For?