explanations Flashcards
(23 cards)
y use interquartile range over range
- IQR
- Range take into account, lowest, highest, inaccurate
who got wider spread of data
interquartile range, () is higher than interquartile range, ()
shorter height of box-and-whisker box means
more spread out data
box n whisker vs standard deviation
box n whisker: relative 2 median
standard deviation: relative 2 mean
box whsiker
every segment 25%/ 1/4
no pun intended
mean higher means…?
jst like median
increased ____
low SD means
____ more consistent as SD value is higher
will SD // mean change if -2 to all data?
data: 1, 2, 3, 4
SD wont change
Mean will -2
will mean change when x2?
SD will x2
Mean will x2
why positive int cant be sqrt(2)
integers cannot be irrational numbers
is 0.45454545… reccuring?
yes
all reccuring numbers are rational.
how to write null set
{} // ∅
{ ∅} not accepted, { ∅} is not an empty/null set as it contains element ∅
desc change of shape of cumulative curve if median higher, IQR unchanged
curve shifts horizontally 2 right of original curve
conversely, if IQR unchanged, median lower
curve shift horizontally 2 left of original curve
desc change of shape of cumulative curve if median unchanged
smaller IQR
- the point (median coord) remains unchanged
- curve will be steeper than original curve
conversely,
if median unchanged, higher IQR
curve will be gentler than original curve
when given non-discreete data
y issit dat mean is an estimate only?
- ___ are given in a range
- we can only use midvalue, not exact value of ____
- mean ___ can only be an estimate
describe portion A relative to portion B
https://docs.google.com/document/d/1L9cBxt23gB118AfUEOHQPQWu4CZqvQcbJ5AzNt-0s2s/edit?tab=t.0
spread of ___ for lowest 25% is greater than spread of ___ for highest 25%
is matrix A = matrix B?
https://docs.google.com/document/d/1L9cBxt23gB118AfUEOHQPQWu4CZqvQcbJ5AzNt-0s2s/edit?tab=t.0 pg 12
no.
Order of matrix different.
SD vs IQR
when use?
SD -> spread, data, relative, mean (no outliers)
IQR -> spread, data, relative median (outliers)
spd vs velocity
spd: only positive
velocity, positive, negative, indicate direction
zero direction, zero magnitude means…
not a scalar,
zero vector
initial, terminal point same
denoted by “0”
binomial thereom power must be…
positive integer
if they ask
box and whisker A vs box and whisker B
B has more ppl who exceed 60 marks than A
Compare %tage of ppl who exceed 60 marks from B compared to A
which set of numbers, when added to original set of numbers, will cause SD to decrease?
Since numbers from () is clustered about (mean),
SD will be smaller than original value
when dS/dt = 0
particle is…
instantenously at rest
