module 4 - 10.6 representing variation graphically Flashcards

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1
Q

what is discontinuous variation?

A
  • measures certain values
  • no in between values
  • caused by genetic factors
  • presented as bar chart or pie chart
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2
Q

what is continuous variation?

A
  • measurements any values
  • continuum of values
  • caused by genetic and environmental factors
  • caused by genetic and environmental factors
  • polygenic and polyallelic
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3
Q

what is a normal distribution curve?

A

bell shaped curve

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4
Q

what are the features of a normal distribution curve?

A
  • bell shaped - symmetrical about the mean
  • mean, mode and median are the same
  • half above the mean, half are below
  • low values at extremes
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5
Q

what is standard deviation?

A

quantitative measure of the spread of data about the mean

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6
Q

when would you use students PAIRED t-test?

A

when measurements come from the same individual/group

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7
Q

when would you use students UNPAIRED t-test?

A

when measurements come from different individuals/groups

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8
Q

what do you need to do before calculating students t-test?

A

produce a null hypothesis

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9
Q

what is the null hypothesis?

A

a prediction that there is no significant difference between the 2 data sets and that any difference is due to chance alone

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10
Q

what is the alternative hypothesis?

A

a prediction that there is a significant difference between data sets and the difference is not due to chance

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11
Q

what are degrees of freedom?

A

n1 + n2 - 2

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12
Q

what is x̄1?

A

mean of first sample

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13
Q

what is x̄2?

A

mean of second sample

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14
Q

what is s1?

A

standard deviation of first sample

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15
Q

what is s2?

A

standard deviation of second sample

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16
Q

what is n1?

A

number of measurements in first sample

17
Q

what is n2?

A

number of measurements in second sample