2. populations and samples 0.0 / 5 ? AllnutritionUniversityOther Created by: eviebradCreated on: 17-02-23 11:09 what is a population a group of people, places or things that have at least one common characteristic 1 of 30 what is a sample portion or fraction of a population 2 of 30 when do we make inferences back to the population as long as sample is representative of the population 3 of 30 what is meant by a representative sample sample or subgroup of a population similar to the population on the characteristics of interest 4 of 30 what is meant by biased not representative of a population 5 of 30 how does a biased sample affect validity poor external validity 6 of 30 what is external validity the generalisability of the results of a study 7 of 30 what is simple random sampling selection of participants for a study that provides equal chance of selection for all people in a population 8 of 30 what is a sampling frame the accessible population from which the sample is drawn 9 of 30 how is a simple random sample carried out choose some form of random number generator 10 of 30 what is a stratified sample population is divided on the basis of some characteristic before random selection 11 of 30 an example of strata academic status- first, second or third year 12 of 30 what is systematic sampling procedure for the selection of participants in a study in which every nth individual on a list is selected 13 of 30 is systematic sampling random only random if the population list is in a random order 14 of 30 random sampling unrealistic low chance of getting everyones name on sampling frame and them taking part 15 of 30 what is convenience sampling selecting the research participants that are accessible and convenient to researcher 16 of 30 descriptive research concerned with status and experimenter does not manipulate anything 17 of 30 primary concern of descriptive research establishing external validity 18 of 30 why is random sampling used in order to maximise the chances that the sample is representative of the target population 19 of 30 what does it mean if a convenience sample is used must be cautious with accepting findings 20 of 30 experimental research involve manipulating independent variables to study effect on dependent variables whilst holding control variables constant 21 of 30 experimental research attempts to establish why 22 of 30 inclusion criteria participants must have characteristics to qualify for participation 23 of 30 exclusion criteria characteristics participants must not possess 24 of 30 how can we know who to generalise the findings of a study to needs to be plausible that findings will apply to population 25 of 30 why would you look at participants section of the methods to see characteristics we can generalise to people with similar characteristics 26 of 30 examples of when cannot generalise study used all untrained subjects cannot generalise to half marathon runners 27 of 30 sample size large enough to be representative/reliable, drop out accounted for 28 of 30 what is a power analysis statistical procedure to calculate how many people needed in the test 29 of 30 randomised control trial provide definitive answer if a new treatment is better than control group 30 of 30
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