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9-12 Integrated Math 1 Unit 3 Lesson 15

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Unit 3, Lesson 15

Comparing Data Sets

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Integrated Math 1

Practice

Problem 1

Twenty students participated in a psychology experiment that measured their heart rates in two different situations.

<p>Dot plot from 70 to 105 by 5’s. Situation A. Beginning at 70, number of dots above each increment is 0, 1, 4, 5, 5, 4, 1, 0.<br>
</p>

<p>Dot plot from 70 to 105 by 5’s. Situation A. Beginning at 70, number of dots above each increment is 1, 2, 4, 6, 4, 2, 1, 0.<br>
</p>

What are the appropriate measures of center and variability to use with the data? Explain your reasoning.
Which situation shows a greater typical heart rate?
Which situation shows greater variability?

Problem 2

Invent two situations that you think would result in distributions with similar measures of variability. Explain your reasoning.
Invent two situations that you think would result in distributions with different measures of variability. Explain your reasoning.

Problem 3

The data set and some summary statistics are listed.

11.5
12.3
13.5
15.6
16.7
17.2
18.4
19
19.5
21.5

mean: 16.52
median: 16.95
standard deviation: 3.11
IQR: 5.5

How does adding 5 to each of the values in the data set affect the shape of the distribution?
How does adding 5 to each of the values in the data set affect the measures of center?
How does adding 5 to each of the values in the data set affect the measures of variability?

Problem 4

Here are two box plots:

<p>Box plot from 95 to 115 by 5’s. Box plot A. Whisker from 98 to 100. Box from 100 to 109 with vertical line at 105. Whisker from 109 to 115.</p>

<p>Box plot from 95 to 115 by 5’s. Box plot B. Whisker from 96 to 99. Box from 99 to 111 with vertical line at 103. Whisker from 111 to 113.</p>

Which box plot has a greater median?
Which box plot has a greater measure of variability?

Problem 5

ForLesson 13: More Standard Deviation

The depth of two lakes is measured at multiple spots. For the first lake, the mean depth is about 45 feet with a standard deviation of 8 feet. For the second lake, the mean depth is about 60 feet with a standard deviation of 27 feet.

Noah says the second lake is generally deeper than the first lake. Do you agree with Noah?

Problem 6

ForLesson 12: Standard Deviation

The dot plots display the height, rounded to the nearest foot, of maple trees from two different tree farms.

<p>Dot plot from 3 to 14 by 1's. Height in feet. Beginning at 3, number of dots above each increment is 0, 0, 0, 1, 2, 3, 2, 1, 0, 0, 0.</p>

<p>Dot plot from 3 to 14 by 1's. Height in feet. Beginning at 3, number of dots above each increment is 0, 1, 0, 2, 0, 3, 0, 2, 0, 1, 0, 0.</p>

Compare the mean and standard deviation of the two data sets.
What does the standard deviation tell you about the trees at these farms?

Problem 7

ForLesson 11: Comparing and Contrasting Data Distributions

Which box plot has an IQR of 10?

Problem 8

ForLesson 9: Technological Graphing

What effect does eliminating the lowest value, -6, from the data set have on the mean and median?

-6
3
3
3
3
5
6
6
8
10

Problem 9

ForLesson 7: Angle-Side-Angle Triangle Congruence

Mai wrote a proof that triangle is congruent to triangle . Mai's proof is incomplete. How can Mai fix her proof?

We know side is congruent to side and angle is congruent to angle . By the Angle-Side-Angle Triangle Congruence Theorem, triangle is congruent to triangle .

<p>Triangles ADE and CBE meet only at point E. Angles A and C are congruent. Sides AE and CE are congruent.</p>