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How do you ensure generalizability?
To increase our confidence in the generalizability of the study, it would have to be repeated with the same exercise program but with different providers in different settings (either worksites or countries) and yield the same results.
Why do we use representative sampling?
A representative sample allows researchers to abstract the collected information to a larger population. Most market research and psychological studies are unsuitable in terms of time, money, and resources to collect data on everyone.
Is a cohort study a representative sample?
However, in the successive follow-ups of the cohort member, study participants must be a representative sample of those included in the baseline. In this type of study, losses over time may cause follow-up bias.
What does generalizability of results mean?
So, what is Generalizability? Very simply, generalizability is a measure of how useful the results of a study are for a broader group of people or situations. If the results can only be applied to a very narrow population or in a very specific situation, the results have poor generalizability.
Why are control variables important in a study?
Control variables enhance the internal validity of a study by limiting the influence of confounding and other extraneous variables. This helps you establish a correlational or causal relationship between your variables of interest. Aside from the independent and dependent variables, all variables that can impact the results should be controlled.
Is the sample size always representative of the population?
The sample will never be perfectly representative of the larger population. In general, the larger the sample, the more likely it will be representative of the population. You need to strike a balance between sample size and real-world variables like time and cost.
Which is one of the most important demographic variables?
Demographers also analyze the effects of population growth and its control. Several demographic variables play central roles in the study of human populations, especially fertility and fecundity, mortality and life expectancy, and migration.
Which is the best example of a control variable?
Examples of control variables Research question Control variables Does soil quality affect plant growth? Temperature Amount of light Amount of wa Does caffeine improve memory recall? Participant age Noise in the environment Do people with a fear of spiders perceiv Computer screen brightness Room lighting