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Statistical Inference Videos 12 videos

AP Statistics 1.5 Statistical Inference
206 Views

AP Statistics 1.5 Statistical Inference. Which of the following statements is false?

AP Statistics 2.1 Statistical Inference
27 Views

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...

AP Statistics 1.1 Statistical Inference
259 Views

AP Statistics: Statistical Inference Drill 1, Problem 1. Which of the following statements is true?

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AP Statistics 2.1 Statistical Inference 27 Views


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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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