Monday, July 27, 2009

What kind of graph would this represent?

A high school algebra class performs a statistical experiment. Each of the 32 students in the class uses a computer program to generate a five-digit random number. All the students who get an even number raise their hands. For example, there might be 17 students who get an even number.





A designated student records the number of even numbers. This experiment is performed a large number of times. Finally, the counts of even numbers from all the experiments are plotted on a frequency histogram where the classes are 'number of evens.' Which of the following best describes the shape of the histogram?





Can someone help me please and no lectures on doing my own homework...my book doesn't ellaborate.





A. Bimodal Skewed


B. Unimodal Skewed


C. Unimodal symmetric


D. Bimodal symmetric


E. Uniform

What kind of graph would this represent?
Forget all the algebra class hooey - Think about it this way:


A random number generator produces 32 numbers and you then count how many even numbers there are. This is exactly like making 32 flips of a fair coin, right?





The range of numbers can be from 0 to 32, but for the most part, the average or mean will be about 16.5.





If you were to plot out the histogram, you would have a normal distribution, just like the standard bell curve. My first instinct was to say uniform, but I'm leaning toward


C) Unimodal Symmetric,


(because it best describes a bell shaped curve -


one mode with an even distribution on each side).





Good luck in your studies,


Mikey
Reply:I wish I saw your question earlier too!


Don't worry too much about remembering formulas,


statistics is a lot about the thought process behind them.





Glad to help,


Mikey Report It

Reply:Bimodal symmetric because each time the same number of students raise their hands. The outcomes will be different each go round but the number of participants is continually the same. Were it to be skewed different numbers of participants would need to be polled on each survey. You are welcome now go to church.
Reply:i have never heard of this.....





probably uniform





i would google all these just to make sure.


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