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