Evidence-Based Practice for Nurses

11.2 Sampling Methods At the end of this section, you will be able to: ‹ Differentiate between probability and nonprobability sa ...

Type of Sampling Assumptions Possibility of Bias Representativeness Other Comments Simple random sampling Each subject has the s ...

returned to the container and this process continues until 10 student names have been selected. Should one of the selected stude ...

that a sample of 200 students is necessary to achieve representativeness. After selecting the start point, the researcher select ...

to smaller clusters or subsets of a population. First, researchers identify all ele- ments that could be included in a study. Th ...

Nonprobability Sampling Methods A second category of sampling methods is nonprobability sampling. These methods do not require r ...

Type of Sampling Assumptions Possibility of Bias Representativeness Other Comments Convenience sampling Inclusion criteria iden ...

Quota Sampling When researchers sample from strata without randomly selecting elements, they are using quota sampling. Like stra ...

When obtaining a purposive sample, researchers often use what is known as snowball sampling, or network sampling. When using thi ...

Determining Sample Size After the sampling method is identified, researchers must decide how large a sample is needed. Various f ...

Another factor that researchers need to consider when conducting quantita- tive studies is attrition rate, also known as dropout ...

There are also factors that determine sample sizes in qualitative studies. These factors include the scope of the study, the phe ...

whether samples represent target populations. Nurses should expect detailed accounts of sampling methods, sample sizes, and recr ...

Researchers have a responsibility to protect all subjects, especially those who are considered to be in a vulnerable population. ...

If there are risks to subjects, those risks must be clearly detailed and include any physical, emotional, spiritual, economic, s ...

One reason that considerable attention is given to the process of obtaining informed consent is that it is unethical for subject ...

Apply What You Have Learned As your EBP committee has progressed in its assignment to identify strategies to improve hand hygien ...

REFERENCES Albert, N., O’Connor, P., & Buelow, J. (2012). How many subjects do I need in my research sample? Clinical Nurse ...

CHAPTER OBJECTIVES KEY TERMS At the end of this chapter, you will be able to: ‹ List the 5 Ss ‹ Discuss the types and purposes o ...

At the end of this section, you will be able to: ‹ List the 5 Ss ‹ Discuss the types and purposes of other sources of evidence O ...