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Chapter 1: Histograms

Chapter 1: Histograms. Shay I, Kyra E, Jessica A, Christian M . What is a histogram? .

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Chapter 1: Histograms

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  1. Chapter 1: Histograms Shay I, Kyra E, Jessica A, Christian M

  2. What is a histogram? A graphical representation, similar to a bar chart in structure, that organizes a group of data points into user-specified ranges (the ranges you choose). The histogram condenses a data series into an easily interpreted visual by taking many data points and grouping them into ranges or classes. *Frequency- the number of times a value reoccurs in a given category *Class- A set, collection, group, or configuration containing members that have certain attributes or traits in common; a kind or category

  3. Why do we use it? You would use a histogram when you want to tell how many items are in each numerical category or to compare each class interval to the total number of items.

  4. What else do you need to know? • Great for large sets of data • Flexible when setting up class intervals • Does NOT display individual data • Good for comparing multiple distributions when vertical scales are equal • Bars DO touch on histograms

  5. Example 1-Concert Survey You’re a surveyor at a concert and you see a wide range of different ages you decide you want to know how old they are. The ages were from 5 to 59 years old. You decide to put the results into groups of 6: The 0 to 9 years old range, The 10 to 19 years old range, etc... So when someone says "I am 17" you add 1 to the "10-19" range.

  6. Lets Try One.. • You're a teacher looking at grades you want to figure out how many kids made specific grades.

  7. Answer- Did you all get it?

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