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Lesson 6 Stem and Leaf and Scattergraphs .. Mathswatch 89/87.

Lesson 6 Stem and Leaf and Scattergraphs .. Mathswatch 89/87. 1) Reflect the shape below in the y axis. Copy the shape below into your exercise books and draw 5 more shapes that tessellate with it. GCSE Maths Starter 6. Simplify 3a + 2b + 5a – 7b Simplify x⁸ ÷ x ² What is 354 ÷ 6.

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Lesson 6 Stem and Leaf and Scattergraphs .. Mathswatch 89/87.

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  1. Lesson 6 Stem and Leaf and Scattergraphs..Mathswatch 89/87.

  2. 1) Reflect the shape below in the y axis. Copy the shape below into your exercise books and draw 5 more shapes that tessellate with it. GCSE Maths Starter 6 Simplify 3a + 2b + 5a – 7b Simplify x⁸ ÷ x² What is 354 ÷ 6

  3. Lesson 6 Stem and Leaf and Scattergraphs..Mathswatch 89/87. To put raw data into a stem and leaf diagram. To interpret stem and leaf diagrams. To Complete scatter graphs and describe the relationship/correlation. EXTN: To make predications using a scatter graphs. (Grade C)

  4. Lesson 6 Stem and Leaf and Scattergraphs.Mathswatch 89/87. How to Draw One: 1. Put the first digits of each piece of data in numerical order down the left-hand side 2. Go through each piece of data in turn and put the remaining digits in the proper row 3. Re-draw the diagram putting the pieces of data in the right order 4. Add a key

  5. Lesson 6 Stem and Leaf and Scattergraphs.Mathswatch 89/87. Here are the marks gained by 30 students in an examination: 63 58 61 52 59 65 69 75 70 54 57 63 76 81 64 68 59 40 65 74 80 44 47 53 70 81 68 49 57 61 Write the tens figures in the left hand column of a diagram. These are the ‘STEMS’ 4 5 6 7 8

  6. Lesson 6 Stem and Leaf and Scattergraphs.Mathswatch 89/87. Here are the marks gained by 30 students in an examination: 63 58 61 52 59 65 69 75 70 54 57 63 76 81 64 68 59 40 65 74 80 44 47 53 70 81 68 49 57 61 Go through the marks in turn and put in the units figures of each mark in the proper row. These are the ‘LEAVES’ 8 1 3 4 5 6 7 8

  7. Lesson 6 Stem and Leaf and Scattergraphs.Mathswatch 89/87. Here are the marks gained by 30 students in an examination: 63 58 61 52 59 65 69 75 70 54 57 63 76 81 64 68 59 40 65 74 80 44 47 53 70 81 68 49 57 61 0 4 7 9 2 9 4 7 9 3 7 5 9 3 4 8 5 8 1 When all the marks are entered the diagram will look like this: 5 0 6 4 0 8 1 0 1 1 3 4 5 6 7 8

  8. Lesson 6 Stem and Leaf and Scattergraphs.Mathswatch 89/87. Here are the marks gained by 30 students in an examination: 63 58 61 52 59 65 69 75 70 54 57 63 76 81 64 68 59 40 65 74 80 44 47 53 70 81 68 49 57 61 0 4 7 9 2 3 4 7 7 8 9 9 1 1 3 3 4 5 5 8 8 9 Rewrite the diagram so that the units figures in each row are in order: 0 0 4 5 6 0 1 1 4 5 6 7 8

  9. Lesson 6 Stem and Leaf and Scattergraphs.Mathswatch 89/87. Now…… 0 4 7 9 2 3 4 7 7 8 9 9 Add a KEY: 1 1 3 3 4 5 5 8 8 9 0 0 4 5 6 5|2 = 52 0 1 1 4 5 6 7 8

  10. Lesson 6 Stem and Leaf and Scattergraphs.Mathswatch 89/87. Remember: - Always put in a Key - Always put your data in Order Median: - to work out the median, you must find the middle value - if there are two middle values, you need the average Range: - to work out the Range, subtract the smallest number from the biggest

  11. The stem & leaf diagram below shows the masses in kg of some people in a lift. • How many people were weighed? • What is the range of the masses? • Find the median mass. units Stem Leaf tens 4 Median is the mean of the 8th and 9th data values. 1 3 3 3 6 4 8 4 3 0 5 2 1 6 7 2 2 7 6 1 (c) 56 kg 8 Stem and Leaf For You To Try… (a) 16 people. (b) 86 – 31 = 55 kg

  12. Lesson 6 Stem and Leaf and Scattergraphs.Mathswatch 89/87. One For you

  13. Lesson 6 Stem and Leaf and Scattergraphs.Mathswatch 89/87. • You can draw a line of best fit on Data • A line of best fit roughly follows the pattern of the points • It does NOT have to go through any points or start on the axes… Positive Correlation  As one value increases, the other increases Negative Correlation  As one value increases, the other decreases No Correlation  There is no pattern in the data (and therefore no line of best fit…)

  14. Lesson 6 Stem and Leaf and Scattergraphs.Mathswatch 89/87.

  15. Lesson 6 Stem and Leaf and Scattergraphs..Mathswatch 89/87. To put raw data into a stem and leaf diagram. To interpret stem and leaf diagrams. To Complete scatter graphs and describe the relationship/correlation. EXTN: To make predications using a scatter graphs. (Grade C)

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