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Playlist PSAT® Math 45 videos
PSAT 1.1 Math Narrative Walkthrough. In how many hours will James and Steve meet?
PSAT 1.2 Math Narrative Walkthrough. Which graph represents the equation?
PSAT 1.3 Math Narrative Walkthrough. How many full packages of secret ingredient does the company have to buy to make one 50-gallon batch?
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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