Ali .,Sampling Exercise

7/30/2019 Ali .,Sampling Exercise

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Assignment: Exercise 8

Question1:

1.1>Population

Population in this study is incorrect because this study

doesnt state the population. Fathers and premature infants

are population.

1.2>SampleSample is fathers and premature infants admitted into

the NICU of university hospital in southern Thailand during

July-November 2006. Sample in this study is correct.

1.3>Sample size

Sample size in this study is not appropriate because

according to Polit and Beck (2004) if the study base on the

effect size 0.70, power 0.80 and alpha 0.05 the sample size

must be 32/group but in this study only 26/group.

1.4>Sampling technique

The sampling technique of this study is appropriate.

Purposive sampling was used in the selection process


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because of limitation of the number of premature infant in

this study and computer minimization technique was used to

divide sample in to control group and kangaroo care group

to control confounding variable.

Question2:

Independent variable: Kangaroo care

Dependent variable: Paternal positive feel and perceived

self-efficacy

Population is low birth weight infant in Thailand.

2.1>We use proportional estimation form the population. We

identify the number of low birth infant in Thailand.

Population is 95,000 (Unicef, 2000). Using calculation of

Yamane;

n= N/ (1+Ne2)

n= sample

N= population = 95,000e= error (estimate 5%)

n = 95,000/ {1+ [95,000x (0.5)2]}

= 398.32


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Sampling= 398

2.2> Purposive sampling was used in the selection process

because of limitation of the number of low birth weight

infant in Thailand. This technique can control confounding

variable and make the sample has characteristic because we

define inclusion and exclusion criteria. Cluster sampling

technique is appropriate for a large sample at a lower cost.

The Influence of Breastfeeding Attitude and Subjective

Norm on Intention to Exclusive Breastfeeding of Mothers in

Dhaka, Bangladesh

Question 1:Based on the provided information, please analyze

and critique the following topics in terms of definition,

correctness, clarification, and completeness. Try to write,

provide rational and suggestion if those are still incorrect,

incomplete or unclear.

1.1 PopulationPopulation is the group of patients that the researcher

wants to draw conclusions about. According to the

research topic, supposed the population of this study


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was the mothers in Dhaka, Bangladesh. But the

researcher stated that the population in this study was

all postpartum mothers admitted in the postnatal ward,

Dhaka Medical College Hospital, Bangladesh. So, that

the population in this study is unclear.

1.2 Sample

Sample in this study should be the postpartum mothers

admitted in the postnatal ward, Dhaka Medical

College Hospital, Bangladesh. But the researcher

stated that is the population of this study. So that, the

sample in this study is not complete and not clear.

1.3 Sample size

The sample size in this study is correct because theresearcher use Thorndikes formula to calculate the

sample size:

n (10k) + 50


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From the calculation, the researcher supposed to have

at least 70 samples but the researcher only got 65

samples. The researcher use the Nunnally and

Bernstein (1994) that they need only 30 sample per

independent variable to perform regression analysis.

1.4 Sampling technique

Purposive sampling is the sample is selected based on

the purpose of the study and because of some

characteristics (http://sociology.about.com/od/Types-of-

Samples/a/Purposive-Sample.htm). Samplingtechnique

in this study is correct, complete and clear because the

researcher describe the inclusion criteria of the mother

and the infants.

Question 2: If you want to do the research which consists of

the similar independent and dependent variables as the

previous study 1 and 2 but with different population and

sample (replication with other sample), please answer the
http://sociology.about.com/od/Types-of-Samples/a/Purposive-Sample.htmhttp://sociology.about.com/od/Types-of-Samples/a/Purposive-Sample.htmhttp://sociology.about.com/od/Types-of-Samples/a/Purposive-Sample.htmhttp://sociology.about.com/od/Types-of-Samples/a/Purposive-Sample.htm


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following questions:

The Influence of Breastfeeding Attitude and Subjective

Norm on Intention to Exclusive Breastfeeding of

PrimiparaMothers in Hong Kong.

2.1 Please demonstrate how to estimate or calculate

sample size. Please provide reasons that you choose

those methods.

According to Yamane:

n = N/ (1+Ne2)

= 123 069/ (1 + (123

069 x (0.05)2)

= 399

We choose this calculation method because we have

the number of population of primipara mothers in

Hong Kong.

2.2 Please identify sampling technique and rational that

you use that technique.

n = sample

N = population = 123 069

(Lau, 2009)

=


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A purposive sampling method was used to recruit the

eligible subjects who meet the inclusion criteria. The

inclusion criteria for the postpartum mothers were

normal labor, no flat or inverted nipple, no history of

AIDS or HIV infection, no skin lesions that is

communicable to infant; and the inclusion criteria for

the infants were healthy full term infants and no cleft

lip or cleft palate.

Ali .,Sampling Exercise

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