Download presentation

Presentation is loading. Please wait.

Published byBryce Ward Modified over 9 years ago

1
S2A Chapter 7 More about Statistical Graphs

2
2009 Chung Tai Educational Press. All rights reserved. © Terminologies about Classes 19.5 24.5 Lower class boundary Upper class boundary 20 2415 1925 29 20 24 Upper and lower class limits Class width 24.5 19.5 5 Class mark 22

3
2009 Chung Tai Educational Press. All rights reserved. © Frequency Distribution Table Waiting Time of 100 Passengers at a Bus Stop Waiting time (min) Class boundaries (min) Class mark (min) Frequency 5 - 94.5 - 9.5716 10 - 149.5 - 14.51218 15 - 1914.5 - 19.51720 20 - 2419.5 - 24.52217 25 - 2924.5 - 29.52714 30 - 3429.5 - 34.53211 35 - 3934.5 - 39.5374

4
2009 Chung Tai Educational Press. All rights reserved. © Frequency Polygons

5
2009 Chung Tai Educational Press. All rights reserved. © Cumulative Frequency Table Waiting time less than (min) Cumulative frequency 4.50 9.516 14.534 19.554 24.571 29.585 34.596 39.5100

6
2009 Chung Tai Educational Press. All rights reserved. © Cumulative Frequency Polygon

7
2009 Chung Tai Educational Press. All rights reserved. © Percentiles Percentile represents a given percentage of the data less than a given value.

8
2009 Chung Tai Educational Press. All rights reserved. © Change the cumulative frequency to percentage. For example: 74% of students got the examination scores below 66.4. Percentiles 100% 90% 80% 70% 60% 50% 40% 30% 20% 10%

9
2009 Chung Tai Educational Press. All rights reserved. © The score of 66.4 is called the 74th percentile and is denoted by P 74. It means 74% of S2 students have scores less than 66.4. If there are 200 students in total, there are 148 (74% 200) students have scores less than 66.4. Percentiles

10
2009 Chung Tai Educational Press. All rights reserved. © Quartiles The percentiles P 25, P 50 and P 75 divide the number of data into 4 equal parts, so they are called quartiles. P 25 is also called the lower quartile (denoted by Q 1 ). P 50 is also called the median (denoted by Q 2 ). P 75 is also called the upper quartile (denoted by Q 3 ).

11
The End

Similar presentations

© 2024 SlidePlayer.com Inc.

All rights reserved.

To make this website work, we log user data and share it with processors. To use this website, you must agree to our Privacy Policy, including cookie policy.

Ads by Google