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Tallies are a way to mark the occurance of a vote for a catagory. The number representing the tallies is a frequency. A cumulative frequency is a running total of votes or occurances. Study the frequency chart on the next slide and prepare to complete your own.
Then complete the chart on the slide after next. Now click okay to continue. Frequency charts Tally Frequency Cumulative Frequency 10 2 6 8 7 3 7 + 3 = 10 10 + 6 = 16 26 + 8 = 34 16 + 10 = 26 34 + 2 = 36 26 36 34 16 10 7 Tally Frequency Cumulative Frequency 5 7 6 33 13 18 7 Tally Frequency Cumulative Frequency 6 7 3 16 10 7 Again... Tallies are a way to mark the occurance of a vote for a catagory. The number representing the tallies is a frequency. A cumulative is a running total of votes or occurances. This tells how many total votes or occurances there were. After reading this slide click okay. Frequency charts Histograms are similar to bar graphs except they group data into ranges. This is handy when data can't easily be divided into categories. An example would be runners finishing a race. Times may be too spread out for categories. Therefore, intervals are used instead. Your benchmark exams are divided into intervals of 20 as follows. 1-20 21-40 41-60 61-80 81-100
The interval range for this data is . Each interval must have the same range. When we subtract the low from the high, we must have the same range. Complete the chart below. 10 - 14 15 - 19 20 - 24 5 - 9 0 - 4 The interval range is the high of any row minus the low of the same row. The interval range for this data is . 9 - 12 13 - 16 17 - 20 5 - 8 1 - 4 The interval range is the high of any row minus the low of the same row. The interval range for this data is . 21 - 30 11 - 20 31 - 40 41 - 50 1 - 10 The interval range is the high of any row minus the low of the same row. The interval range for this data is . 101 - 125 51 - 75 26 - 50 76 - 100 1 - 25 The interval range is the high of any row minus the low of the same row. Please complete the missing minimums and maximums for the intervals below. - 21 - 40 61 - 41 - 1 - 20 Please complete the missing minimums and maximums for the intervals below. - 26 - 50 - 51 - 1 - 25 Please complete the missing minimums and maximums for the intervals below. - 20 - 24 30 - 25 - 15 - 19 Please complete the missing minimums and maximums an interval range of 19. - 8 - 48 - - - 107 Please complete the missing minimums and maximums an interval range of 3. - 8 - - - - 27 Please complete the missing minimums and maximums an interval range of 14. - 8 - - - - 82 Before beginning these practice exercises on
Box and Whisker plots, please gather the following:
Calculator Yesterday's notes Pen/Pencil
Good Luck ! Step 2: Determine the median value of the data: Step 3: Now use the median to divide the data into 2 groups Given the following data on ages of children. 10,12,9,7,10,12,6
Construct a box and whisker plot. Step 4: Median of the lower quartile Group 1: Step 1: Put the data in order from least to greatest. Record the values of your median, lower quartile and upper quartile to answer questions on the next slide. , , , , , Group 2: , Median of the upper quartile What is the lowest value of the data? What is the highest value of the data?
(Problem continued from previous slide)
data on ages of children. 10,12,9,7,10,12,6
Construct a box and whisker plot. Warm Up Exercises.
subtract the lowest # from the highest # sum of numbers ÷ number of data put data in order, find middle value which ever #(s) that occur the most How do you find the range of a given set of data? Use the box and whisker plot to answer the questions.
What is the median value of the data? What is the median of the lower quartile? 20 What is the median of the upper quartile? 30 38 What is the age of the youngest student?
What is the age of the oldest student?
What is the range of the data in this diagram? 8 Ages of Students 10 12 14 16 18 What is the median value of Nike Sneakers? Which brand of sneakers has a price range of $10? Reebok What is the value of the median of the lower quartile for Nike Sneakers? Nike 32 34 36 38 40 42 44 46 48 50 52 Average Prices of Sneakers Reebok Nike |