# Shared Flashcard Set

## Details

Biostatistics Chp 1-7
Mideterm prep
24
Science
05/06/2012

Term
 Population
Definition
 the complete collection of all elements ( scores, people, measurements) to be studied . All subjects to be study.
Term
 Census
Definition
 is the collection of data from every member of a population
Term
 Sample
Definition
 is a sub collection of members from part of a population
Term
 Parameter
Definition
 is a measurement describing some characteristic of a population ( Sample: 2100/500trout=4.1 mean : 4.1 is parameter)
Term
 Statistic
Definition
 is a measurement describing some characteristic of a sample ( Sample: 45% out of 877, 45% statistic.)
Term
 Qualitative Data
Definition
 Consist of number representing count of measurements ( The weight of manatees)
Term
 Qualitative Data (categorical or atattribute) Data
Definition
 can be separated into different categories that are distinguished by some non non numerical characteristic( The gender of bears)
Term
 Discrete Data
Definition
 result when the number of possible values is either a finite number or countable ( 0,1,2...) (the number of eggs a chicken lays)
Term
 Continues Data
Definition
 result from infinitely many possible values that correspond to some continues scale that covers the range of values without gaps or interruptions . ( the gallons of milk cow gives )
Term
 Nominal
Definition
 data that consists of names, labels, or categories only. Cant be arranged in low or high) ( colors, yes, no, undecided )
Term
 Ordinal
Definition
 can be arranged in some order, but difference between data values either cannot be determined or are meaningless(Ranks and grades)
Term
 Interval level of measurement
Definition
 like ordinal, with the difference of two values is meaningful. Data does not have a natural zero starting point.(temperature )
Term
 Ration level of measurement
Definition
 is the interval level with addition of a natural zero starting point (weights, and ages)
Term
 Observational study
Definition
 we observe and measure specific characteristic but we don't attempt to modify the subject being studied.
Term
 Experiment
Definition
 we apply treatment and them proceed to observe its effects on the subject
Term
 Cross sectional study
Definition
 data are observed, measured, and collected at one point in time
Term
 retrospective
Definition
 Data collected from the past by going back in time (records )
Term
 Prospective
Definition
 data are collected in the future from groups sharing common factors
Term
 Random Sample
Definition
 members from a population are selected in such a way that each individual had the same change of being selected
Term
 Simple random Sample
Definition
 of size "n" subject is selected in such a way that every possible sample of the same size "n" has the same change of being selected
Term
 Systematic Sampling
Definition
 randomly select a starting point and the select every kth (50th ) element in the population
Term
 convenience sampling
Definition
 we simply collect result that are easy to get
Term
 Stratified Sampling
Definition
 we subdivide that population into at least 2 different subgroups that share that same characteristic ( age or gender)then we draw s sample from each group.
Term
 Cluster Sampling
Definition
 we first divide the population area into section, then randomly select some of those clusters and the choose all the members from those selected clusters.
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