Upcoming SlideShare
×

# Biol h u1

922 views

Published on

Published in: Technology
0 Likes
Statistics
Notes
• Full Name
Comment goes here.

Are you sure you want to Yes No
• Be the first to comment

• Be the first to like this

Views
Total views
922
On SlideShare
0
From Embeds
0
Number of Embeds
5
Actions
Shares
0
5
0
Likes
0
Embeds 0
No embeds

No notes for slide

### Biol h u1

1. 1. 1 Statistical analysis Introduction This mixed oak forest is a mature stage in the development of plant communities surrounding bodies of water. Studying the growth rate of the trees such as maple, beech, oak and hickory gives us evidence of the health of these plant communities. This is an Africanized honey bee (AHB). AHBs have spread to the USA from Brazil. They are now in competition with the local bee population, which are European This is the common bean plant used by honey bees (EHBs). EHBs were brought many students in their classrooms. Bean to America by European colonists in the plants grow in about 30 days under banks 1600s. AHBs are now out-competing of artiﬁcial lights. Seeds are easy to obtain. EHBs in areas the former invade. Germinated seeds can be placed in paper cups with sterilized soil. Many factors can In this chapter, you will learn how scientists analyse the evidence they collect be tested to determine whether or not they when they perform experiments. You will be designing your own experiments, so aﬀect the growth of the bean plants. this information will be very useful to you. You will be learning about: • means; • standard deviation; • error bars; • signiﬁcant difference; • t-test; • causation and correlation. Have your calculator by you to practise calculations for standard deviation and t-test so that you can use these methods of analysing data when you do your own experiments. 1.1 Statistics Assessment statements 1.1.1 State that error bars are a graphical representation of the variability of data. 1.1.2 Calculate the mean and standard deviation of a set of values. 1.1.3 State that the term standard deviation is used to summarize the spread of values around the mean, and that 68% of values fall within one standard deviation of the mean. 1.1.4 Explain how the standard deviation is useful for comparing the means and spread of data between two or more samples. 1.1.5 Deduce the signiﬁcance of the difference between two sets of data using calculated values for t and the appropriate tables. 1.1.6 Explain that the existence of a correlation does not establish that there is a causal relationship between two variables. 101-Biol_01_001_011.indd 1 27/11/07 09:38:01