Extra Flashcards
1
Q
Large sample size
A
- more representative
- findings not due to chance
2
Q
Repeats
A
- identify anomalies
- calculate reliable mean
3
Q
Control groups
A
- compare affects
4
Q
Calculate ratios/percentages
A
- more comparable
5
Q
Evalutation
A
- correlations doesn’t mean causation- other factors
- unknown sample size
- no repeats
- no controls
- length of study unknown
6
Q
Standard deviation
A
- overlapping
2.difference is not significant - due to chance
7
Q
Null hypothesis
A
there is no significant difference
difference is due to chance
8
Q
p> 0.05
A
reject null hypothesis
significant difference
not due to chance
9
Q
p< 0.05
A
accept null hypothesis
not significant difference
due to chance
10
Q
T test
A
judge significance of difference between the means of 2 sets of data from 2 groups
11
Q
T value
A
mean1 - mean 2 /
(variance1^2/ sample1 - variance2^2/sample2)
12
Q
Correlation coefficient
A
whether 2 variables correlate
13
Q
Correlation coefficient formula
A
sum of (mean
14
Q
Use of SD
A
- shows reliability of mean in repeat experiments
- calculate standard error
15
Q
Contamination techniques
A
- bunsen flame- convection currents draw microbes away
- disinfect work tools and desk
- flame work tools
- keep lid on petri dish to prevent unwanted bacteria contamination
16
Q
Calibration curve
A
- measure absorbance of each concentration
- plot graph of absorbance on y axis
- concentration on x axis
17
Q
Microscope use
A
- measure using eyepiece graticule
- calibrate eyepiece graticule against stage micrometre
18
Q
Steps for potometer
A
- cut shoot under water at a slant
- connect to potometer
dry leaves - ensure no air bubbles present
- ensure airtight
- distance bubble moves in a certain time
19
Q
Processed data
A
calculations made from raw data
20
Q
Microscope use
A
- squashing- ensure one cell thick so light can pass through
- stain- structures are visible
