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- xxImHisGirlxx

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- xxImHisGirlxx

1. Use the website www.shodor.org/interactivate/activities/histogram/index.html to complete this assignment.
Look at the dataset for "Gas Mileage for Year 2000 Cars."
Set the bin width to six and describe the distribution

- xxImHisGirlxx

I don't understand how to do this, at all. @jim_thompson5910

- jim_thompson5910

`bin width` means the width of each histogram bar
basically it's another way of saying `interval size`

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## More answers

- jim_thompson5910

set "interval size" to 6 and hit the "update interval" button

- xxImHisGirlxx

so, it changed it to 6.000, is that right?

- jim_thompson5910

yeah I have that too

- jim_thompson5910

you should see a lot of thin bars

- xxImHisGirlxx

Now what is it asking me to describe?

- jim_thompson5910

basically they want the overall shape of the distribution

- jim_thompson5910

is it symmetrical? skewed left? skewed right?

- xxImHisGirlxx

What is the distribution?

- jim_thompson5910

the distribution is the collection of numbers
visually it's shown as a histogram

- xxImHisGirlxx

and is it skewed left?

- jim_thompson5910

well it turns out that the median is 496 and the mean is 507.1734104046
I pasted the numbers (from that text box) into OpenOffice Calc. It's a free spreadsheet program. I used the AVERAGE and MEDIAN functions to find the mean and median.
Anyways, because the mean is larger than the median, we have a distribution that is skewed right. Notice we have outliers on the right side. These values pull the mean to the right skewing it.

- xxImHisGirlxx

What about this one?
2. Use the website www.shodor.org/interactivate/activities/histogram/index.html to complete this assignment.
Many statisticians suggest about seven bins for a histogram. Try this method out on the datasets for "NBA Team Payrolls" and "Horsepower of Cars."
What bin width did you choose for each?

- jim_thompson5910

hmm I'm not sure. It seems like any whole number would work as long as it's not too small

- jim_thompson5910

15 or 20 seems to work

- xxImHisGirlxx

Use the website www.shodor.org/interactivate/activities/histogram/index.html to complete this assignment.
Many statisticians suggest about seven bins for a histogram. Try this method out on the datasets for "NBA Team Payrolls" and "Horsepower of Cars."
Enter in the dataset {1, 3, 4, 5, 6, 7, 9}.
Can you choose a bin width for which the data appears skewed right? If so, what is that bin width?
Help me with this one?

- jim_thompson5910

alter the "interval size" and try to make the distribution skewed right. Basically try to have the majority of the distribution on the left side with outliers on the right side

- xxImHisGirlxx

I'm so lost, I really don't understand how to do any of this. :(

- xxImHisGirlxx

what does the dataset numbers mean that it gives me?

- xxImHisGirlxx

For "NBA team payrolls" would it be 1? I don't know what I'm doing.

- jim_thompson5910

they want you to type in 1, 3, 4, 5, 6, 7, 9
but do it in a column of numbers

- jim_thompson5910

to be honest, these problems are a bit strange and vague. There is no set rule for what a proper bin size is. This is one reason (of many) why statistics is misleading and can be used to alter the truth in a way

- xxImHisGirlxx

So type in the number in the interval box, but separately?

- jim_thompson5910

no, in the text box below where you see the big column of numbers

- jim_thompson5910

where it says "enter data, 1# per line"

- xxImHisGirlxx

So like this?
9
7
6
5
4
3
2
1

- xxImHisGirlxx

or, this, 12345679?

- jim_thompson5910

yes one big column like you had it the first way

- xxImHisGirlxx

then click update data?

- jim_thompson5910

correct

- xxImHisGirlxx

and then find which one is skewed right?

- jim_thompson5910

yes

- jim_thompson5910

by adjusting the interval size

- xxImHisGirlxx

okay so, I put them numbers in the big column and then play with the interval size until its a skewed right?

- jim_thompson5910

correct

- xxImHisGirlxx

is the 2.773 look right?

- xxImHisGirlxx

on horsepower of cars

- jim_thompson5910

4 looks like a good value to make it skewed right a bit

- xxImHisGirlxx

what about for the nba team playoffs ?

- xxImHisGirlxx

I say 3

- jim_thompson5910

3 works

- xxImHisGirlxx

Thank you so much!!!

- jim_thompson5910

sure thing

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