1 / 19

Unit 4- Statistics HW 7C and 7D Due Wednesday– 30 points

Unit 4- Statistics HW 7C and 7D Due Wednesday– 30 points. Section 7C- Grouped Quantitative Discrete Data. Grouped Quantitative Discrete Data. You can group data values if there are many different data values with low frequencies. Grouping data  class intervals

elda
Télécharger la présentation

Unit 4- Statistics HW 7C and 7D Due Wednesday– 30 points

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Unit 4- StatisticsHW 7C and 7D Due Wednesday– 30 points Section 7C- Grouped Quantitative Discrete Data

  2. Grouped Quantitative Discrete Data • You can group data values if there are many different data values with low frequencies. • Grouping data  class intervals • You still have a modal class, which means what?? • Compare these two Tables: • Data values: Frequency Table • Vs

  3. Column graph for grouped data is the same • Just have the intervals on the x-axis • Most likely you will have grouped intervals for your data. • How would you group GPA? • How would you group ages of students at GWHS

  4. Stem and Leaf Plots • Stem and Leaf plots is a method of writing data in groups without losing information about the actual data value • For numbers with 2 digits • The first digit is the STEM • The second digit is the LEAF • So, in the number 27, 2 is the stem and 7 is the leaf • Examples:

  5. Back to Back Stem and Leaf Plots • A back to back stem and leaf plots allows us to compare sets which are related. • The example is times for the 100 meter freestyle recorded by members of a swimming team • Name two descriptions of the data

  6. Done with Exercise 7C, now it’s your turn to complete a questionOne partner should complete the Zinc half of a stem and leaf, and the other partner should complete the Lead part

  7. Answers to example 7C

  8. This is how I feel

  9. Section 7D- Quantitative CONTINUOUS Data • When we measure data that is continuous, we cannot write down an exact value. Instead we write down an approximation which is only as accurate as the measuring device. • Quantitative Continuous Data is measured using a FREQUENCY HISTOGRAM or just a HISTOGRAM • There are no gaps between the columns • And the modal class is the ______ bar • **** to choose intervals, us the squareroot of the number of data points. For large data sets, we use more classes than less****

  10. Done with Exercise 7D, now it’s your turn to complete a question

  11. Answers to Example 7D

  12. Section 7E- Measuring the Centre of Data • Mean- average • Mean for entire population is μ mu • Mean for sample population is Ë “x bar” • Median- middle value, or average of the two middle values • Mode- value that occurs the MOST, there can be two modes • The calculator will find the mean and median for you • Examples of mean • The average height of adult females is 5 feet 5 inches • The average height of adult females in this class is 5 feet 3 inches • which is the mean for the entire population? • Which is the mean for the sample population?

  13. Find the mean, median, and mode

  14. Answers • Mean = sum of all data/ number of data = 127/18 =7.06 • Median= middle data = 7 • Mode = most frequent data value =there are 5 “5’s” There are three “8’s” There are three “10’s” So, the mode is 5

  15. Find the mean, median, and mode using a calculator Step 1: put data into the calculator -Stat -Enter, Edit -Clear L1 by highlighting L1 and hitting CLEAR and ENTER -Done, so 2nd Quit Step 2: have the calculator find the mean and median for you -Stat - Go right, Calc Enter, for 1-variable Stat Enter

  16. Done with Exercise 7E- Now it’s your turn to do an Example

  17. Answers to Example 7E

  18. Effects of Outliers…central tendency means mean, median, mode

More Related