maths skills for bio

Question 1

what is standard deviation?

Answer 1

-measure of how spread out all your repeats are from your mean

Question 2

what are the advantages of SD instead of the range?

Answer 2

-SD shows the spread around the mean and range only shows difference between largest and smallest value
-SD reduces anomalies, range includes anomalies
-SD can be used to indicate whether the difference between the results is significant

Question 3

what does it mean if there is no overlap with SD?

Answer 3

-LIKELY to be significantly different

Question 4

why should correlation coeffecient be used?

Answer 4

• when there is continous data
  -and you investigating association between the the 2 measurements