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PSAT Math Videos 44 videos

Secret Ingredients
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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?

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PSAT 1.36 Math Diagnostic
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PSAT 1.36 Math Diagnostic. If f represents the cost of his food, which of the following represents Jasper's order?

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Sleep, Precious Sleep 181 Views


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Description:

PSAT 1.4 Math Narrative Walkthrough

Language:
English Language

Transcript

00:00

Thank you We sneak in and here's your shmoop toos

00:05

your brought to you by sleep We'd tell you more

00:08

about it But well it's a real snooze fest All

00:11

right A student at the university of wasa mata conducted

00:14

a survey by asking five hundred random students at her

00:17

university how many hours of sleep they got each night

00:19

and how good their grades were on a standardized test

00:22

The survey concluded that students benefit from more sleep God

00:26

the data table is shown below and the margin of

00:29

error is plus or minus two percent Which of the

00:31

following inferences is most likely false right here the potential

00:35

answers checking this out way Alright wait more sleep equates

00:41

to better academic performance Oh hold the phone Stop the

00:45

presses Muzzle the messenger boy All right so nothing earth

00:49

shattering We all know that when you're well rested you're

00:52

sharper And when you're sharper you score better on tests

00:55

But that's not quite What this question asks were given

00:58

four inferences and we're being asked to pick the one

01:01

that doesn't hold water Yeah it's super important to notice

01:04

that we're looking for the one false inference so we

01:07

can't just find one that checks out and call it

01:10

a day Well let's check out option a and see

01:12

what it's selling most university students at wasim outta you

01:16

sleep more than four hours That true Well according the

01:19

table Yeah totally There are apparently two hundred students who

01:22

sleep less than four hours but one hundred seventy plus

01:25

one Thirty or three hundred students who sleep more than

01:29

that No because is legit We can cross off our

01:31

list Next up option c the majority of students that

01:35

wasa matter you will score ninety three or above on

01:37

the standardized test regardless of how much sleep you get

01:40

Sure check out the median scores ninety three or higher

01:43

across the board regardless of sleep And what is the

01:46

median Tell us Well a median is the exact middle

01:50

number in a data set meaning that at least half

01:53

of each group is going to score ninety three or

01:55

higher on their test making this one true as well

01:58

Wow Impressive They're either some real geniuses in the school

02:02

or these tests include questions like how many fingers do

02:05

you have And is the sun hot What about d

02:09

Students at once a mighty you who sleep more than

02:11

four hours and i generally perform better on standardized test

02:14

than students who sleep less than four hours a night

02:17

Well yeah of course they do And the table backs

02:19

that up Numbers in every category are improved when the

02:22

test taker gets more than four hours asleep Which brings

02:26

us to beat mohr sleep students that wasim body you

02:29

get the better their performances on a standardized test Okay

02:33

probably Yeah but we have to look at what the

02:35

tables telling us here if we check out the median

02:38

column for example there's a definite jumpin quality of performance

02:42

for those with less than four hours asleep to those

02:45

with four to six hours But from four to six

02:48

hours to sixty eight hours Well the ninety three ninety

02:51

four so close that they fall within the margin of

02:53

error Remember that two percent thing In other words they're

02:56

statistically the same And if you look at the median

03:00

or range it's a similar deal So while it's probably

03:03

true that mohr sleep will always lead to a better

03:06

test scores the findings presented in this table don't quite

03:10

close the case Your answer is beached But if you

03:13

just left through this entire video well you probably don't

03:16

have to worry You're alert Well Rest itself is gonna

03:19

ace that exam tomorrow as long as this particular question 00:03:22.7 --> [endTime] And it doesn't come up

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