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Description:

Want to pull an Oliver Twist and ask us for more? We've gotcha covered. Head over to /video/subjects/math/test-prep/ap-statistics/ for more AP Statistics goodness. No porridge included. 

Language:
English Language

Transcript

00:04

And here's your shmoop du jour brought to you by eye

00:06

drops keeping finish line photographers in business since 1945..Your principal [man photographs the end of a horse race]

00:12

wants to know the difference in lateness between students who ride their bikes to

00:16

school and those who drive there, if a confidence interval contains two

00:20

positive numbers what does this information mean for your principal and

00:24

here the potential answers.. Okay in other words who

00:32

causes that five minutes after the bell stampede every morning? Is it the sweaty [Students scramble into the school as alarm bell rings]

00:37

two wheelers, or the amateur NASCAR drivers in the parking lot well to get the answer [Motorbike and car arrive at school and students appear]

00:41

the principal has hired a statistician who proceeded to calculate a 95%

00:45

confidence interval that percentage is for the difference between

00:49

the proportion of bike riders who were late and the proportion of car drivers [person riding a bike and a car ride past the principal]

00:54

who were late...So besides being curious about what they're serving in the

00:59

cafeteria for lunch what else does the guy with the clipboard need to know [Man holding a clipboard in the school corridor]

01:02

nothing.. exactly, he has what he needs there's no missing link here people stay

01:08

with us for a second since the confidence interval was given we don't [Student discussing sample size at the front of the class]

01:11

need sample sizes an actual proportion so we can eliminate C and D as possible

01:16

answers we're comparing bike riders to car drivers and those positive numbers in

01:20

the confidence interval indicates that bike riders are late more than car [Bike and car appear]

01:24

drivers which means that A is the correct answer the only other conclusion

01:29

to be made from this exercise is that there are more bike riders than car [Students holding bike helmets outside the principal's office]

01:32

drivers waiting outside the principal's office..no one ever said confidence

01:36

intervals were fair.

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