# Shared Flashcard Set

## Details

Adv H 3.2 (b) Data handling Qs
RR Quiz Qs
17
Biology
Not Applicable
03/26/2022

Term
 What should a representative sample have?
Definition
 the same mean and range of values as the whole population
Term
 Explain Random sampling
Definition
 Members of the population have an equal chance of being selected
Term
 Explain Stratified Sampling
Definition
 The population is divided into categories that are then sampled proportionally.
Term
 Explain Systematic Sampling
Definition
 Members of a population are selected at regular intervals.
Term
 How to determine accuracy of a instrument
Definition
 Calibration against a known standard
Term
 How to measure precision
Definition
 Repeated measurements or readings of an individual datum point. The variation observed indicates the precision of the measurement instrument
Term
 Why are mean values calculated in experiments with living things?
Definition
 Takes account of the natural variation in the biological material being used
Term
 Independent data sets (replicates) are more reliable if they...
Definition
 are concordant/ show low variability.
Term
 Define Mean
Definition
 Average
Term
 Define Median
Definition
 Middle value in a list in ascending/ descending order
Term
 Define Mode
Definition
 Most common value
Term
 What are Box plots?
Definition
 Diagram which shows on a graph, median, lower quartile, upper quartile and inter-quartile range
Term
 What are Error bars?
Definition
 Indicate variability of data. They indicate how likely the effect on the dependent variable is due to chance. Small ranging error bars, the outcome less likely to be due to chance.
Term
 Causation definition
Definition
 Relationship between two variables that can be reproduced by experimentation.
Term
 Positive correlation definition
Definition
 Both variables are linked by an increase in magnitude.
Term
 Negative correlation definition
Definition
 Variables are related where the increase in one variable causes a decrease in the other
Term
 How to determine the strength of a correlation
Definition
 Correlation is proportional to spread of values from line of best fit.
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