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AP Statistics 2.1 Exploring Data. How does this change affect the mean, standard deviation, and IQR?
AP Statistics 2.1 Statistical Inference 27 Views
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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
Full Transcript
- 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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