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4.3 Bio Maths
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- 1What is standard deviation?Measure of variation. Measure the amount of variation or spread from the mean
- 2What does a low standard deviation mean?Indicates that data has a narrow range and points are closely grouped to the mean- indicates greater reliability
- 3What does a high standard deviation mean?Indicates that the data points have a larger range and are less well grouped- may indicate lower reliability
- 4What is the Student's t-test used to do?Compares two means. Tests the difference between the two means is a sig. difference.
- 5What do you have to do in a Student's t-test?First state a null hypothesis= there is no sig difference between the means of these two sets of data. t-test will test whether we can reject it or accept it.
- 6What are the degrees of freedom?The number of values in a statistical calculation that are free to vary.
- 7Calculation of the degrees of freedom:(sample size) - (the number of data sets)
- 8The number of degrees of freedom and the t-value=Must be taken into account when considering if calculated t-value is significant
- 9What is a significant difference level?5%
- 10If the value of t is greater then 5%..?Consider the two sets of data to be significant
Do not have to accept null hypothesis - 11If the value of t is lower than 5%..?The difference between the two sets of data to be insignificant.
Must accept null hypothesis - 12What is the correlation coefficient used for?Used to consider the relationships between the two sets of data.
- 13What does the Spearman's rank correlation tell us?Whether two sets of data are correlated or not.
- 14What do we need with the Spearman's rank?A null hypothesis- "There is no relationship between eg. light intensity and the per cent plant cover"
- 15Spearman's rank value indicates a correlation using..A table of critical values
- 16If the Spearman's rank is below the critical value=There is no significant correlation
- 17What does a negative mean for the correlation in the Spearman's rank?There is a negative correlation- not a sig correlationCHECK
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- AS level Biology Fichas sobre 4.3 Bio Maths, creado por Alex Selwood-Taylor el 19/04/2017.
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- Alex Selwood-Taylor
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