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StatsCh3

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CH 3
Descriptive
sky's gyms B
Measures of
statistics
darts of
pop
Parameters
parameter
Statistic
is d
is a
Mean
Relative Standing
Statistics
descriptor of the
descriptor
population
of a
sample
Median Mode
Mean
Taveage
of
sum
all
values
and
In
of
by
sample
Parameter population
Mean
divide
I
means
bar
Twith tail
best measure
distributed
of
center
Chapter 3 review
parameter population
Statistics sample
when data is
median
value
normally
best for
skewed
dat
means normal
distribution
resistant
statistic
26
mean
center
or parameter
extreme
by
of
measures
values
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median
9
that isn't affected
mean
the
so
26
is
median
a
resistant
measure
so
data
we
median
use
the
mean
value
that
than
Moth
extreme
has
values
which
better represents
data
skewed
closer
most
occurs
10,15 20,20
20
mean
to
frequently
30
20
0
10,70
issue
or
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is you
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modes
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19
25
30
same mean but
spread of data
15
different
20
20
have
20
multiple modes
variability
ranges
I
Max
Min
Standard deviation
measure of
variability
population
d
standard deviation
sample
standard deviation
s
standard deviation
far
how
theaverage
data from
the
mean
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d
tf
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pick
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is
why
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use
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we're
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parameter if
about
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we
offering
to
statistic
english
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on
is
we
are
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mean and standard
deviation fave units
same as original data
variance
standard deviation
populations 02
samples
units would be
squared
ex
cm
Cm
as opposed to
variance is a resistant
statistic standard deviation
is not
Measures of
Empirical Rule
Relative Standingempirical rule percentiles
quartiles boxplots 2 Score
Observed
68
95
99.7 rule
Applies to data that is relatively
normal
of data
8
1 20
4
16
10
M
951 of red snappers
weigh between 23 3 lbs
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of red snappers
99
Llbs
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about 2
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29 lbs
Leigh between
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what t of
under 23 lbs
y is used because
data was collected
in clam bayou
mean
chance
red snapper
weighs over 31 lbs
or
salinity
21 33 lbs
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for a whole year
6 0.7 psu
salinity measurements between 31.1 31.9
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31.1
1
20
1
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533
37.5
951
of
salinity
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2
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bracket
the
be the
middle
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of
salinity readings
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31 8
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681
of
the data
32 S
0
68
readings that
0.7
are
Quartiles
Percentiles
SATACTScore
90thpercentile you did betterthan 90 of students
of data is belowthat value
what
10th percentile
then that
value such that lot of
data is less
Notation
90th percentile pros 10th
Pa
useful
10
20
in
s
percentile
comparing different data sets
201
Pz
25
30
Quartile
Pso
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1st quartile Q
2nd quartile 02 Median
3rd quartile Q
1g
Borplots
40
got
2
Q
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251
at us
45 Q2
03
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Q2
25
25
251
Median
I
Interquartile Range
shows us middle 501
and we can use this to
compare data sets
to be symmetric
have
ME
in
If it seems
we
below
normal
Nyon
boxplot
distribution
I
right
1
1
Skewed
right
histogram
2
Scores
represents how many standard deviations away from the
mean a data set
25 5
Z
scores
is
Itiatiibone
for
values
mean
is
below mean is
positive
negative
Male Manatees
Eff
Z
find a score
agg
256kg
find
y
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256
score
68
2
z
ddhhmiea.am
2
female
7
1
jY
260kg
2
more
female weighs more
rel
to
M 250
0 5
Female 2
how much does
l S
she
1.5
7 S
weigh
1
353
X
250
242 sk
its pop
SD away
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