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ACT Aspire Science: Wind Speed and Shark Size 6 Views
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Description:
Based on the information in Figure 1, which of the following best describes the linear regression applied to the data for maximum shark size versus the wind speed?
Transcript
- 00:00
Yeah Oh Table one below shows the recorder data from
- 00:10
each scavenging event in this study that whale species in
- 00:14
size and wind direction and speed and figure one illustrates
- 00:20
that relationship of wind speed Teo Maximum shark's eyes straight
- 00:24
line and figure one is a linear regression fit to
Full Transcript
- 00:27
the data points to illustrate a direct relationship between wind
- 00:30
speed and maximum shark sides All right next up based
- 00:35
on the information and figure one Which of the following
- 00:38
best describes the linear regression applied to the data for
- 00:41
maximum shark's eyes versus the wind speed We're going struck
- 00:47
size one side of the equation here in wind speed
- 00:50
on the other list of Graff So the question originally
- 00:53
made us want to run for cover from Sharknado or
- 00:57
Meg NATO the Mega Ladan storm that's coming soon you
- 01:00
know Then we realized the sharks weren't being picked up
- 01:03
and thrown around by that wind instead Well heavier winds
- 01:07
are probably carrying the oh so aromatic scent of dead
- 01:09
whale farther across the ocean and thereby drawing more sharks
- 01:13
to feeding event And many people don't realize this but
- 01:17
there's a new Chanel number six coming out called Dead
- 01:20
Whale Yeah well you see the commercial well As wind
- 01:23
speed increases so does the maximum shark's eyes So this
- 01:27
is a positive correlation or positive relationship Now eliminate all
- 01:31
answer choices that are negative like Kimber today and see
- 01:34
their goodbye in a negative relationship There's just no communication
- 01:38
People just go their own separate await a different kind
- 01:41
of thing Yeah mathematically That means maximum shark's eyes would
- 01:45
decrease as the wind speed increased Write thie r squared
- 01:49
value known as the coefficient of determination It would be
- 01:53
shown on the graph as point five three as in
- 01:56
B Well thiss value help Scientists understand how well that
- 01:59
data fits their predictions that the data is directly related
- 02:03
The point will fit the line nearly perfectly Like you'd
- 02:06
say That's an r squared correlation of one The higher
- 02:10
the number as being positive means everything is kind of
- 02:13
map through the same line If the relationships more complex
- 02:16
on his obvious Nona's directly well correlated and a linear
- 02:20
regression line tends to not run through a large fraction
- 02:24
The point like they're all scattered around it like an
- 02:26
ugly cloud Yeah well the more points a trend line
- 02:29
runs through the higher the r squared number the more
- 02:32
predictable it is And basically what this chart is telling
- 02:35
us is that as wind speed increases more dead whale
- 02:39
sentence and way out into the ocean tracts bigger and
- 02:42
bigger sharks to that dead well so that's it The 00:02:45.69 --> [endTime] answer is B positive correlation point five three
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