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What are the measures of center? What are the measures of Spread? . Thursday, February 6 th. EOCT Week 4-# 4. Which statement is TRUE about the function? The function is always decreasing . The function values are always negative . The function has no maximum or minimum . - PowerPoint PPT Presentation
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Thursday, February 6th
1. What are the measures of center?
2. What are the measures of Spread?
EOCT WEEK 4-#4 Which statement is TRUE about the function?a. The function is
always decreasing.
b. The function values are always negative.
c. The function has no maximum or minimum.
d. The range is {1}.
QUIZ TOMORROW 1. Mean 2. Median 3. Mode4. MAD 5. Range 6. IQR 7. Outliers
Comparing Data
HOMEWORK ANSWERS
Goal: Outlier effecting measures of
CENTER
CLASSWORK ANSWERS
Goal: Comparing measures of center
and spread
REMEMBER! Measures of
Center
1. Mean 2. Median3. Mode
*How CENTERED the data is
Measures of Spread
1. Range 2. MAD 3. IQR
*How SPREAD out the data is
Mean Median Mode
RangeMADIQR
IQR
Steps to find the Interquartile Range
1. Arrange the data from least to greatest.2. Find the median.
3. Find the median of the lower quartile, .4. Find the median of the upper quartile, .
4. Find the difference between the quartiles.
Median IQRSample A
Sample B
Compare Centers: Compare Variance/Dispersion/Spread:
IQR ON CALCULATOR 1. Enter data into L12. STAT- CALC-1VARS3. Scroll down to see
Q1Q3
Find difference
Median IQR
Sample A Sample B
Compare Centers: Compare Variance/Dispersion/Spread:
Median
IQR
Car A Car B Compare Centers:
Compare Variance/Dispersion/Spread:
Outliers
1. Find IQR.
Q3 – Q1
2. Multiply IQR by 1.5
1.5(IQR)
3. Determine the upper and lower boundaries.
Lower: Q1 – 1.5(IQR)Upper: Q3 +
1.5(IQR)4. Any data outside the
upper and lower boundaries is an outlier.
Steps
1. Find IQR.
Q3 – Q1
2. Multiply IQR by 1.5
1.5(IQR)
3. Determine the upper and lower boundaries.
Lower: Q1 – 1.5(IQR)Upper: Q3 +
1.5(IQR)
Lower:Upper:
4. Any data outside the upper and lower boundaries is an outlier.
Questions to Example 1: 1. What are the outliers?
2. How has the outlier affected the center of the data?
3. How has the outlier affected the spread of the data?
Analyze
1. Find IQR.
2. Multiply IQR by 1.5
3. Determine the upper and lower boundaries.
4. Any data outside the upper and lower boundaries is an outlier.
Questions to Example 2: 1. What are the outliers?
2. How has the outlier affected the center of the data?
3. How has the outlier affected the spread of the data?
Analyze
WORKTIME
1.Ticket to Go
2.Homework