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what is discrete/discontinuous variation
characteristic that can only result in certain values
no in between values
genetic factors falls into what category of variation
discontinuous/discrete variation
what is an example of discontinuous variation
an animal’s sex (female or male)
blood type
how can discontinuous variation be represented
bar chart
pie chart
what is continuous variation
characteristic that can take any value within a range
graduation in values with two extremes (continuum)
what are examples of continuous variation
height and mass of plants and animals
what are polygenes
number of genes control characteristics that show continuous variation
what type of data does normal distribution use
continuous
what are characteristics of a normal distribution
mean, mode and median are the same
bell-shaped and symmetrical
what is standard deviation
measure of how spread out the data is (greater standard deviation, greater the spread of data)
what percentage of values are within one standard deviation
68% of values
what percentage of values are within two standard deviations
95% of values
what percentage of values are within three standard deviations
99.7% of values
what does the student’s t test compare
compare the means of data values of two populations
what is the spearman’s rank correlation coefficient for
to consider the relationship between two sets of data
when should you reject null hypothesis
if t-value is more than > critical value
due to chance
conclude there is a significant difference
when should you accept null hypothesis
if t-value is less than < critical value
not due to chance
conclude there is no significant difference
how to lay out answer to t-test
state null hypothesis
accept or reject null hypothesis
due or not due to chance
Note 
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