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Happy First Day of SPRING!!!. Get out your HW from Last Night WARM UP: Read Pgs 174-175 and complete problems 1-6 on page 176 DEAR when finished. Population: Pet store Costumers Sample: 100 Costumers Bias: Not all costumers have dogs Systematic Random Population: Deli customers
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Happy First Day of SPRING!!! Get out your HW from Last Night WARM UP: Read Pgs 174-175 and complete problems 1-6 on page 176 DEAR when finished
Population: Pet store Costumers Sample: 100 Costumers Bias: Not all costumers have dogs Systematic Random Population: Deli customers Sample: Sunday’s customers Bias: The sample does not include week-day customers 5) Systematic 6) Stratified Warm Up: Read pgs 174-175Complete Problems 1-6 on Pg 176
HOMEWORK Problem Solving • 225 in² 2) 9 ft³ 3) 3 oz 4) 44.25 in² 5) D 6) G 7) C 8) F Homework and Practice • 384 ft 2) 528 ft 3) 768 ft 4) 864 ft 5) 1056 ft 6) 1296 ft 7) 1032 ft 8) 1848 ft 9) 24 cm 10) 78 cm 11) 44 cm 12)56cm 13) 30 cm 14) 83 cm 15) 73 cm 16) 91 cm 17) 80 mi 18) 7 cm 19) 64 ft x 36 ft
Stem and Leaf Plots A graph used to organize and display data so that the frequency can be compared. Last Digit First Digit (S) Stem Leafs KEY 0 2,5,6 1 2 = 12 1 3, 3, 7, 8 2 0, 2, 6 3 1, 7, 9 4 0, 5, 8 Data Values: 2, 5, 6, 13, 13, 17, 18, 20, 22, 26, 31, 37, 39, 40, 45, 48
Double Stem and Leaf Plot(Back-to-Back Stem and Leaf Plot) • Used to compare 2 sets of data • Remember data increases from the set out Division of US Senate Data Set: Democrats: 46, 46, 54, 56, 57, 58, 61, 61, 64 ,68 Republicans: 32, 36, 37, 38, 41, 42, 43, 44, 53, 54 Democrats Republicans 3 2 , 6, 7, 8 6 , 6 4 1, 2, 3 , 4 8, 7, 6, 4 5 3, 4 8, 4, 1, 1 6 4 1 means 41 6 4 means 46
Frequency / Cumulative Frequency Tables • Frequency Tables: A Table that lists items together according to the number of times, or frequency, that the item occurs. • Cumulative Frequency Table: Column in your table that keeps a running total.
EX) Millions of Dollars for 20 IMAX films 76, 51, 41, 38, 18, 17, 16, 15, 13, 13, 12, 12, 10, 10, 6, 5, 5, 4, 4, 2 Step 1: Look at range to choose the scale and equal intervals for the data Highest Number: 76 Lowest Number: 2 Range o numbers: 2 – 76 Scale: : Count by 20’s Step 2: Find the number of data values in each interval. Write these numbers in the frequency column. Step 3: Find the Cumulative frequency by adding all the frequency values that are above or in that row. 0-19 16 16 20 -39 17 1 2 19 40 – 59 1 20 60 - 79
Measures of Central Tendency Can you name all 4 Measures of Central Tendency? Mean, Median, Mode, Range Mean: The Average – Add up all the numbers and divide by how many numbers are in the number set Median: The middle number Mode: the number that occurs the most in a data set Range: The difference between the highest number and lowest number in a data set
Find the Mean, Median, Mode, and Range Ex1) 21, 28, 32, 28, 30, 29, 21 Mean: 27 Median: 28 Mode: 21 , 28 Range: 32 – 21 = 11 Ex2) 15, 21, 13, 25, 12, 21, 14, 17 Mean: 17.25 Median: 16 Mode: 21 Range: 25 -12 = 13 21, 21, 28, 28, 29, 30, 32 15 + 17 = 32 32 / 2 = 16 12, 13, 14, 15, 17, 21, 21, 25
CLASSWORK • You must complete all Three Rotations • You will have 20 minutes at each table to complete the worksheet • When you are finished turn in to bin on table. Make sure your name is on it. • Rotate only when you hear to claps and GO! LETS GET TO WORK!!!
