Statistics and computer

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Transcript Statistics and computer

1010
1000
990
980
970
960
Series1
950
940
930
920
male
female
140
120
100
80
All
60
Sites
40
20
All
0
blue
yellow
green
red
orange
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Probability: is a way to measure the chances that something will occur in relation to the possible
.
alternatives
12
10
8
6
4
2
0
"1-5"
"6-10"
"11-15"
"16-20"
"21-25"
"26-30"
4
3.5
3
2.5
2
1.5
1
0.5
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
theoretical distribution
actual data
0%
3%
14%
2%
sargassum
1%
0%
0%
manatee grass
shoal grass
red mangrove leaf
black mangrove leaf
"sea cigar"
detritivores
turtle grass
80%
 Variance
and
standard
deviation: are 2
values that are
used in statistics
to describe how
far away your
data from the
mean.
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6.7
7.3
7.5
7.5
9.4
9.8
11.2
12.5
13.1
17
δ2 = 10.8
δ = 3.3
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The chi-square test can be used to see if
there are any significant differences
between data sites or source.
The t-test is an equation used to design tests
whether there is a significant difference
between the means of 2 independent
samples.
 Question: should the fearless have rejected
the null hypothesis?
 Answer: yes, the fishers should have the null
hypothesis because their T-statistic value
was calculated to be 3.75, which is greater
than the critical value of 2.145 from the Tstatistic table at 14 degrees of freedom and
at the p-value of 0.05.
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