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Thursday, February 14, 2013

Tonight's strange homework!

Soooooooooo, in case you hadn't noticed, we missed a whole bunch of school due to the storm!  Well, I had planned for you to take a test yesterday and obviously that didn't happen!  In order to get out test done before break, I have given you the test in class and am allowing you to work on it at home this evening.  Please feel free to use your notes and review posts on the blog to help you.  THIS WILL NOT COUNT AS A FULL TEST, rather as a graded assignment/quiz.  I will be able to decide once I have a better understanding of how it goes for everyone!

As you know from our discussion in class, I fully acknowledge that I was not able to teach you about Histograms prior to giving out the test, yet they are on the assignment.  As I said in class, I want you to do your best on that question, using the notes, examples and information that I provide in this post.  I will also give you a few minutes in class tomorrow to further review the concept of a Histogram.  I will very likely give partial credit and/or reduce the points on that question so that it is fair.  To be totally honest, I want to see how everyone handles the problem before I decide.  For example, if everyone does really well on it, I don't want it to be worth less.  Once again, I am going to play it by ear and let you know!

And now, on to Histograms...

From Mathisfun.com


A Histogram is a graphical display of data using bars of different heights.
It is similar to a Bar Chart, but a histogram groupsnumbers into ranges
And you decide what ranges to use!

Example: Dress Shop Survey

You asked customers who bought one of the "Aurora" range of skirts how old they were.
The ages were from 5 to 25 years old.
You decide to put the results into groups of 5:
  • The 1 to 5 years old range,
  • The 6 to 10 years old range,
  • etc...
So when someone says "I am 17"
you add 1 to the "16-20" range.

And here is the result:

You can see (for example) that there were 30 customers between 6 and 10 years old

Histograms are a great way to show results of continuous data, such as:
  • weight
  • height
  • how much time
  • etc.
But if your data is in categories (such as Country or Favorite Movie), then you should use a Bar Chart.

How to make a Histogram:

A Histogram Problem:

See you tomorrow!  We'll spend some time in class tomorrow going over the Histograms and finishing everything up, but please finish the test tonight so we just need to do a quick review and check over in class tomorrow!

-Miss K  :)

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