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PSAT Math Videos 44 videos
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PSAT 1.4 Math Diagnostic 216 Views
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Description:
PSAT 1.4 Math Diagnostic. Which of the following conclusions is supported by the data in the graph?
More Video DetailsTranscript
- 00:00
Thank you We sneak And here's your shmoop du jour
- 00:05
brought to you by south africa There are actually not
- 00:08
as many superheroes living in cape town as you might
- 00:10
expect Night Check up grab here Which of the following
- 00:17
conclusions is supported by the data in the graph And
Full Transcript
- 00:20
here the potential answers So what's it asking Well we've
- 00:26
got four possible conclusions over here but only one of
- 00:29
them is backed up by the information we've been giving
- 00:32
The other three can take a flying leap for a
- 00:34
weekend made up The trick is to figure out which
- 00:37
three are trying to pull a fast one on us
- 00:39
let's take them one at a time and see if
- 00:40
we're buying what they're selling Option b says that as
- 00:43
chlorophyll increases sea surface temperature increases because they are positively
- 00:49
correlated That is totally correct on opposite day according to
- 00:53
the graph As chlorophyll concentration increases sea surface temperature decreases
- 00:58
that's why is the line moves from left to right
- 01:00
These numbers here are getting bigger while these were getting
- 01:03
smaller not unlike our pool of possible answer choices these
- 01:07
out of here What about c Which suggests that if
- 01:09
chlorophyll concentration is zero than the sea surface temperature is
- 01:14
approximately twelve degrees centigrade All right well let's take our
- 01:17
little finger Actually Any of them will do and find
- 01:19
the point of the graph at which the concentration of
- 01:22
chlorophyll is zero right here Looks like that line of
- 01:25
best fit is hovering A bit over the sixteen degree
- 01:28
mark which unless mathematicians recently switched it up on us
- 01:32
is not the same as twelve degrees but we can
- 01:35
reduce our concentration on choiceseat zero next up is option
- 01:38
d if the sea surface temperature is less than fourteen
- 01:40
degrees centigrade the chlorophyll concentration is less than ten well
- 01:44
here's the part of the graph represented by everything under
- 01:47
fourteen degrees and if we're to extend our line of
- 01:49
best bit out of ways we'd see that everywhere it
- 01:52
falls inside the shaded area the chlorophyll concentration is more
- 01:56
than ten not less so this option is a shady
- 01:59
is so new graph will next d answer is the
- 02:02
right choice If the sea surface temperature is fifteen degrees
- 02:06
centigrade or phil concentration is likely to be between eight
- 02:09
point zero and eight point five Yeah here's fifteen degrees
- 02:13
right along this axis and if we go straight across
- 02:15
to the line of best fit yet that totally falls
- 02:18
somewhere between a chlorophyll concentration of between eight and eight
- 02:21
point five we're really glad we got the right answer
- 02:24
but we're going to take a break now and lie
- 02:26
down for a bit Some reason we're seeing dot home
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