Systematic
random sample
Under this type of
inspection is divided into vocabulary
of society and of the number N)) to a number of groups each group
containing
K)) of the vocabulary as the K = note that the vocabulary of the
community
organized according to a particular system was being arranged in
ascending or
descending Example: Order of the homes by sequencing in a street, and
when
choosing a sample of regular is first choice of a single one at random
from the
first group and in the light of the sequence of individual selected from
the
first group is chosen Single of the second set after adding the number
(K) on
the sequence of the individual first and so add number
K)) on the sequence of the
second individual to receive a
single second, and so on for another single. In other words, Single is
selected
from the first group randomly either the rest of the vocabulary is
chosen to
equal the dimensions of the vocabulary first.
Example: The order of (24)
Talibahsb descending
sequence of grades to be chosen systematic random sample of (6) students
to
identify the cause of the falling level of the exam.
- In the beginning we
divide the students to (6) the
totals of each group containing (4) students and Klati:
45,44,43, 42,41,40 /,
37,35,34,32,31,29 /,
28,27,25,24,22,20 /, 18,17,16,15,14,13
The number of students in
the group as follows: 4 = K =
Under the
multi-stage sample
Style preview
multiple stages are divided into
statistical
community to units previews are then withdrawn a simple random sample of
these
units the initial first phase is then divided the primary units
selected into
smaller units called units, secondary and selected a simple random
sample from
each unit Aaltanuep and per unit of initial stage seconds and then
dividing the
selected secondary units to smaller units are selected random sample of a
second stage and continue the process of division and selection until
access to
the vocabulary that is collecting data from them.
For
example, when conducting
a study to estimate the average Iraqi family consumption of sugar
substance. So
the unit statistical data can be obtained which is the Iraqi family,
when
selecting a sample cluster is to divide Iraq into provinces as units
previews
to select a random sample of the provinces as a first stage and then
dividing
the provinces selected in the first stage to the districts of a second
stage
sample is selected randomly from a second stage then the division of
secondary
units selected in the second phase to the aspects are selected random
sample of
the third phase and then dividing the areas selected in the third stage
to the
shops housing is a randomly chosen sample from stage a fourth and
divided the
shops selected to the alleys, including the sample is selected randomly
and
divided in turn into Alldoralexanip that are Choose a random sample of
this is
to get the families that Process
which data are collected.
Non-random samples
Which that
group of
vocabulary selected from the statistical community a way that the
researcher
entered in the selection of the vocabulary and to considerations
relating to
the manner of research and study, and these samples are divided into two
types:
1 - sample intentional.
They deliberately selected
sample we believe
in advance that the vocabulary of this sample is better than a community
study.
For example, when studying the ways to promote the sport of football, it
is
best to choose a sample of professional sport of football and the fact
that
intentional that this sample is the experience of the affairs of this
sport
2 - sample Alhssip.
Under this type of
sampling is the statistical
division of society into several layers based on criteria related to
Btabiepaldrasp, then the sample is selected from all intentional layer
(random)
is proportional to its size and class size in the community, and the total
volumes of these samples represents a deliberate sample size Alhssip
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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