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AP Statistics 2.1 Exploring Data
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AP Statistics 2.1 Exploring Data. How does this change affect the mean, standard deviation, and IQR?

AP Statistics 5.1 Exploring Data
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AP Statistics 5.2 Exploring Data
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AP Statistics 5.2 Exploring Data. Which method would not be a good option?

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AP Statistics 3.1 Exploring Data 206 Views


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Description:

AP Statistics: Exploring Data Drill 3, Problem 1. What does this information tell us?

Language:
English Language

Transcript

00:02

Put this in your calculator and shmoop it.

00:05

In a stem and leaf plot showing ages of people attending the Tri-State Science Fair,

00:10

one row reads "3, 0 0 0 4 5 8 9 9."

00:18

This information tells us that... what?

00:21

And here are the potential answers...

00:26

We're given a single row from a stem and leaf plot, and we need to interpret it to figure

00:31

out which of our answer choices is true.

00:34

Remember that in a stem and leaf plot, the

00:35

stem is typically the tens value, and the leaves are the individual ones place values.

00:40

From this row, we know that the values in our stem and leaf plot are:

00:45

30, 30, 30, 34, 35, 38, 39, and 39. Now we can answer the question.

00:52

Answer choice A says that the median is 34.5. To find the median, we just find the middle

00:58

value of all of the data. But wait a second... we only know one row of values, and we don't

01:03

know the others. There could be any number of values in the

01:06

10's place, or 40's place...or anywhere. We simply don't know.

01:10

So we can eliminate answer choice A. Answer choice B wants us to find the mode,

01:14

or the most frequently occurring value in the data set.

01:18

But again, we don't know the other values in this data set...so it can't be B either.

01:22

If we take a quick scan of choices C, D, and E...

01:25

we realize we can't find the min and max in choices D and E either...

01:29

...again, because we don't know all the values of the data set.

01:32

The only answer choice left is (C).

01:34

C says that there were two 39 year olds at the science fair.

01:40

It just so happens that we have the row with people in their 30's, and it also just so

01:44

happens that there were exactly 2 people who were age 39.

01:49

Our answer is (C).

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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...