So your study is a quasi_expermental study and this one best method to collect data is total coverage of all nurses working in the selecting hospitals or unit if the number is to Haigh... Also you able to reduce sampling by by regulate inclusion and exclusion criteria... In this way you not need any formula to calculate sample size

This study ues simpel random sample and health education guide line for nurses

Yes, I agree with Alshazaly .

I think the quasi-experimental design will do the job.

isuggested simple randum sampling

Quazi Experimental Design is the best and You can do Simple Random sampling since you can get the Sampling frame from the hospital registry. Then your result validity and Generalizability can be enhanced

The best design is a simple random sampling.

pre and post intervention study according to my study

Dear enthusiastic researcher,

If you are at research design phase, take time to finalised till your research design did not give you satisfaction.

Your issue; effectiveness of education,

I don’t know, is it one just a super specific area like nebulization knowledge?

Here,

Respondents are; homogenous so sampling techniques are: convenient sampling or random sampling. I prefer convenient sampling.

Regard sample size, you can think about this:

Sampling, Statistical basis of the sample size:

The sample size calculation equation use showing below:

n=(z^2 pq)/d^2 ; n=(〖1.96〗^2×0.5×(1-0.5))/〖0.05〗^2 =384.16≈384 Here,

n = number of samples

z = 1.96 (95% confidence level)

p= prevalence estimate (50% or 0.5) (as no study found)

q = (1-p)

d = Precision of the prevalence estimate

Hope best for you.

Random sampling is the best sampling technique for a study on the effect of educational intervention on nurse's knowledge and practice. This technique is appropriate for homogenous respondents and can accurately represent the population.

The best design is a simple random sampling.

The best sampling technique for a study on the effect of educational intervention on nurses' knowledge and practice would depend on the specific research question, study population, and the resources available.

However, some commonly used sampling techniques that may be appropriate include:

Ultimately, the best sampling technique will depend on the specifics of the study and the research question being asked. Choosing a method appropriate for the study design is important and will provide valid and reliable results.