Maths Biology

Question 1

What is standard deviation?

Answer 1

A measure of how spread out all of your repeats are from the mean.

Question 2

What are the advantages of using the SD over the range?

Answer 2

-SD shows the spread of data around the mean, wheras the range is onlt the difference between the highest and lowest value.
-SD reduces the abnormalties, where as the range includes anomalies
-SD can be used to indicate whether a difference between results is significance.

Question 3

Why would knowing the SD be more useul for a conclusion?

Answer 3

If you add or minus the standard deviation from the means there is no overlap this indicates it is likely to be a significant difference.

overlap= not a significant difference.

Question 4

When should you use a correlation coefficient?

Answer 4

When your data is continous data( eg taking measurements)
Investigation a association between two measurements.

Question 5

When should you use a student Test?

Answer 5

Continous data
Investigating a differnce between two means

Question 6

When should you use a chi squared test?

Answer 6

Frequencies(counting how many individuals are in each catagory)

investigating a differnce