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Section 7.3 (p. 259)

Section 7.3 (p. 259). Vocabulary. List the 3 measures of Central Tendency A) Mean ( ): _________________________ B) Median: ____________________________ C) Mode: _____________________________. Average. Middle #. # that occurs the most. Vocabulary. #’s used to summarize.

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Section 7.3 (p. 259)

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  1. Section 7.3 (p. 259)

  2. Vocabulary • List the 3 measures of Central Tendency A) Mean ( ): _________________________ B) Median: ____________________________ C) Mode: _____________________________ Average Middle # # that occurs the most

  3. Vocabulary #’s used to summarize 1) Statistics: ____________________ ____________________________ 2) Measure of Dispersion: _________ ____________________________ 3) Range: ______________________ & compare sets of data Tells us how spread out the data values are Biggest - Smallest

  4. Vocabulary 4) Standard Deviation : _______ : ________________________ n : ___________ Mean Sigma (Standard Deviation) # of terms

  5. EXAMPLE 1 Find measures of central tendency • TEST SCORES TEST SCORES: 42, 72, 81, 95, 98, 58, 77, 75, 52 83, 97, 45, 89, 93, 57, 82, 97, 75 42, 45, 52, 57, 58, 72, 75, 75, 77, 81, 82, 83, 89, 93, 95, 97, 97, 98 76 79 75 & 97 Mean: ________ Median: ________ Mode: ________

  6. EXAMPLE 2 Find Range • TEST SCORES TEST SCORES: 88, 25, 78, 95, 67, 54 70 Range: ________

  7. EXAMPLE 2 Find Standard Deviation • TEST SCORES TEST SCORES: 88, 25, 78, 95, 67, 54 ( 25 – 68) 2 = 1849 ( 54 – 68) 2 = 196 ( 67 – 68) 2 = 1 ( 78 – 68) 2 = 100 ( 88 – 68) 2 = 400 ( 95 – 68)2 = 729 23.36 Standard Deviation: ________

  8. Writing Data Sets as a LIST OF VALUES • The data set gives the scores for the University of Georgia football team over a 12 game season. 49 21 28 10 7 24 21 12 17 35 42 14

  9. Writing Data Sets as a FREQUENCY TABLE

  10. FINDING STANDARD DEVIATION W/ CALCULATORS • GRAPHING • STAT • 1) EDIT • ENTER #’s in L1 • STAT • Rt Arrow – CALC • 1-VAR STAT • ENTER…ENTER

  11. FINDING STANDARD DEVIATION W/ CALCULATORS YELLOW BLUE data 2nd DATA (STAT) ENTER #’s in L1 - 1-VAR 2nd data (stat) DATA Hit ENTER 4 times - Enter #’s (use arrow) - 1-Var Stats - FRQ = 1 (frequency) - DATA – L1 STATVAR - FRQ – ONE - use arrow key to scroll - CALC

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