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AP Statistics 2.2 Exploring Data 18 Views


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AP Statistics 2.2 Exploring Data. This five-number summary indicates a distribution that is possibly...what?

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Transcript

00:04

And here's your shmoop du jour brought to you by reality television...[television showing static]

00:07

We're still waiting for them to combine the bachelor with survivor, where a

00:11

handful of people must survive on an island having only been given a rose [people by a campfire on an island]

00:15

each..yeah something like that.. Okay well here we go reality television for better

00:20

or worse mostly worse has taken over the airwaves in the 21st century just for

00:25

fun ish we would like to construct a box plot that displays the number of minutes

00:30

that adults aged 30 to 45 spent watching reality television programming in one

00:35

week when we said funny ish right? The minimum is zero the first quartile, q1 is

00:41

62 the median is 125, the q3 is 133 and the maximum is 360 this five number summary

00:49

indicates a distribution that is possibly what? Other than boring...

00:55

All right here the potential answers...[mumbling]

01:01

All right well let's start by visualizing this sucker here is a number line that [A number line from zero to 360]

01:05

goes from zero or minimum to 360 our maximum; now let's plug in what else we [person plugging in a USB stick]

01:11

know let's think about what we would expect these other numbers to be if

01:15

there was no skew at all which incidentally makes it very tricky to [man hurts himself eating a kebab]

01:20

make chicken kebab but okay we're going from 0 to 360 so we would expect the

01:25

middle value to be around half that or 180 right instead we've got 125 which

01:31

all things being equal should probably be a bit more to the left and then

01:35

there's the third quartile at 133 well that's barely more than the median [numbers on a timeline and beyonce appears]

01:41

meaning that even the value of q3 is one we'd expect to be a little further to

01:47

the left well rather than having all our numbers spread out nicely and evenly

01:51

they're all bunched up on one side almost as if our last piece of data [numbers bunched up close together in a room]

01:55

smelled bad, maybe it's time to take a hint. 360 is definitely an outlier when

02:00

compared to our other data points so C can't possibly be right since we aren't

02:05

given enough information to determine the mean we can nix D and we're told the [Girl reading a piece of paper on the wall]

02:09

values of both q2 the median q3 the third quartile which are close

02:15

in value but not quite the same, so E's out as well really all we needed to do

02:20

was notice that most of our data points are going to be on the left with a long

02:24

tail of distribution over here which means that our data is skewing right and

02:29

that's answer B; good thing the problem gave us all that information otherwise [Boy studying at a desk]

02:33

we might have been skewed...Sorry kabob humor [Man strikes the drums]

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