data handling Flashcards
1
Q
what does a smaller IQR mean?
A
more consistent
2
Q
what does a higher median mean?
A
on average it is …er
3
Q
how do you plot a cumulative frequency graph?
A
- curved line
- plot at end of data class
- cf is on y axis
4
Q
how do you calculate frequency density?
A
frequency / class width
5
Q
how do you plot a histogram?
A
- frequency density on y axis
- add any scale, then use it to get unit area
6
Q
how do you find the median from a histogram?
A
find what data class it is in, then (placement in class / total in class) + starting number * width
7
Q
where do you plot a frequency polygon from?
A
midpoint of data class
8
Q
why is extrapolation not valid?
A
outside the data points
9
Q
how to find number of people in stratified sample?
A
(number in stratum / number in population) * total population size
10
Q
what assumptions are made in capture recapture?
A
-sample is representative
- ppopulation has not changed
11
Q
A
