ms. drake 7th grade math measures of central tendency lesson 4 frequency tables and stem and leaf...
TRANSCRIPT
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Ms. Drake 7th grade Math
Measures of Central Tendency
Lesson 4
Frequency Tables and Stem and Leaf Plots
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Week by Week Essentials
http://mathlearnnc.sharpschool.com/cms/One.aspx?portalId=4507283&pageId=5149151
Go to: Resources for Mathematics: Grade 7 (2003
SCS)Week by Week Essentials
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Measures of Central Tendency Vocabulary
Bar graphBox- and-Whisker PlotCircle GraphCumulative FrequencyDouble Bar GraphFirst QuartileFrequency Table
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Measures of Central Tendency Vocabulary
HistogramLine GraphLower ExtremeMeanMedianModeNegative CorrelationNo correlation
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Measures of Central Tendency Vocabulary
OutlierPopulationPositive correlationRandom SampleRangeSample
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Measures of Central Tendency Vocabulary
Scatter PlotSecond QuartileSectorStem-and-Leaf PlotThird QuartileUpper Extreme
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Frequency Tables
A table that lists items together according to the
number of times, or frequency, that the items
occur.
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Frequency TableA frequency table is a way to organize data into categories,
groupsor intervals.
By including a cumulative frequency column in your table
you can keep a running total of the frequencies in each
interval.
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Reading A Frequency Table
How many chickens owned per family
Frequency Cumulative Frequency
0-5 /// 36-11 ////// 9
12-17 //// 1318-23 // 15
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How to Make a Frequency Table
Collect DataAverage Rainfall per Month in
Malaysia in millimeters:158, 201, 259, 292,
224,130,99,163, 218, 249, 259, 191
First determine the intervals, that is, how are you going to break up or group the data?
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158, 201, 259, 292, 224,130,99,163, 218, 249, 259,
191The range is between
99 to 292Intervals must be even.
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So intervals of 99?
0-99100-199200-299
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Put data in the right interval158, 201, 259, 292,
224,130,99,163, 218, 249, 259, 191
Amount of Rainfall
Frequency Cumulative Frequency
0-99100-199200-299
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Amount of Rainfall
Frequency Cumulative Frequency
0-99 / 1100-199 //// 5200-299 //// // 12
Does not give you exact data info
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Let’s try this website together.
http://www.ixl.com/math/practice/grade-7-create-frequency-charts
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A Stem and Leaf Plot can be used to show how often data values occur and how they
are distributed.
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Minutes Doing HomeworkStems Leaves
2 1 2 6 9 3 2 2 5 6 8 4 3 5 5 5 7 8 5 6 4
The stems
are the tens
digits
There are no data values in
the 50’s
The leaves
are the
ones digits
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Venezuela 21Columbia 35Ecuador 23
Peru 24Bolivia 11
Chile 5Argentina 20
Uruguay 6Paraguay 13
Brazil 64French Guiana 6
Suriname 5Guyana 6
Numbers of Endangered Species
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21, 35, 23, 24, 11, 5, 20, 6, 13, 64, 6, 5, 6
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Endangered
Species
5 5 6 6 6 1
1 3
2
0 1 3 4
3
5
4 5 6
4
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Stem Plots
Here is a great website to help you practice how to read and interpret stem and leaf
plots.
http://www.shodor.org/interactivate/activities/StemAndLeafPlotter
/
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Try this on your own.
http://www.glencoe.com/sec/math/studytools/cgi-bin/msgQuiz.php4?isbn=0-02-833050-1&chapter=2&lesson=1