Flashcards
Stat Ch1
Cards in this deck (30)
- 1is the science of conducting studies to collect organize summarize analyze and draw conclusions from datastatistics
- 2is a characteristic or attribute that can assume different valuesvariable
- 3a collection of data values formsdata set
- 4each value in the data set is calleddata value or datum
- 5consist of all subjects (humans or otherwise) that are being studiedpopulation
- 6a group of subjects selected from all subject being studiedsample
- 7consists organization summarization and presentation of datadescriptive statistics
- 8consists of generalization from samples to population preformin estimations and hypothesis test determining relationships among variables and making productioninferential statistics
- 9are variables that have distinct categorical According to some characteristic or attributequalitative variables
- 10are variables that can be counted or measuredquantitative variables
- 11assume values that can be counteddiscrete variables
- 12can assume an infinite number of values between any two specific values. they are obtained by measuring. they often include fractions and decimalscontinuous variables
- 13it classifies data into mutually exclusive (non-overlapping) categorical in which no order or ranking can be imposed on the datathe nominal level of measurement
- 14it classifies data into categories that can be ranked. however precise difference between the ranks do not existordinal level of measurement
- 15it ranks data and precise differences between unit of measure do exist however there is no meaningful zerointerval level of measurement
- 16there exists a true zeroratio
- 17is a sample in which all members of the population have an equal chance of being selectedrandom sample
- 18is a sample obtained by selecting every kth member of the population where K is a counting numbersystematic sample
- 19is a sample optained by dividing the population into subgroups or strata According to some characteristic relevant to the study (there can be several subgroups) then subjects are selected from each subgroupstratified sampling
- 20is obtained by dividing the population into sections or clusters and then selecting one or more cluster and using all members in the Clusters as the members of the samplecluster sample
- 21is the difference between the results obtained from a sample and the results obtained from the population from which the same was selectedsampling error
- 22accuse when the data are obtained erroneously or the sample is biased i.e. non representativenonsampling error
- 23the researcher merely observe what is happening or what has happened in the past and try to draw conclusions based on these observationsobservational study
- 24the researcher manipulates one of the variables and try to determine how the manipulation influences other variablesexperimental study
- 25in an experimental study is the one that is being manipulated by the researcherindependent variable
- 26independent variable is also called theexplanatory variable
- 27the resultant variable is called thedependent variable or the outcome variable
- 28the group that receives the special instruction is called thetreatment group
- 29while the other is called thecontrol group
- 30is one that influences that depended or outcome variable but was not separated from the independent variableconfounding variable
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- Flashcards on Stat110, created by lama S on 26/10/2016.
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