Question

I figured out how to make a histogram. But how do I make a relative frequency graph? I know that I need to have relative frequency on the y axis and class boundaries on the y.
Statplus :S

Answer 1

It relative frequency histogram should look like the attachment

Answer 2

This is the program I'm using. I can't quite decipher it :(

Answer 3

@phi

Answer 4

Here is my first histogram

Answer 5

It looks like you start with your histogram, and divide each bin by the total number of counts (sum of all the bins)

Answer 6

What would sum of all bins be? I don't seem the grasp the concept of bins.

Answer 7

before explaining bins, what does your histogram show?
What is the problem you are doing?

Answer 8

on the x axis we have the range for the number of syllables, and the y axis indicate the number of words.
We have 1 word in this specific magazine that has less than 3 syllables.
wait a minute....
We have randomly selected advertisements, and out of those advertisements we have
14 count of ....? I don't quite get it :-(

Answer 9

Let's look at "5-10" 3 syllables or longer words and we have 14 counts of those... that doesn't make much sense to me.

Answer 10

OK, what I called bins they are calling classes.
btw, your histogram has only 6 classes, so you need 2 more classes.

Answer 11

Oh ok. I'm still having a hard time understanding the histogram.

Answer 12

You have data for 55 different advertisements. The number of ads that have between 5 and 10 "long" words is given by the height of the bar for that class

Answer 13

Let's say advertisement X has 10 long words, that would be representative in 3rd bar of this specific histogram. correct?
(I'll correct the # of bins from 6 bins to 8 bins)

Answer 14

In your histogram yes, in the example histogram it is the 2nd class

Answer 15

makes sense. THanks! Now about relative frequencies.....

Answer 16

If you have 55 items total, divide each class by 55. That changes the number to a fraction.

Answer 17

Oh I did that already. I followed an example in the book without really knowing what I was doing

Answer 18

I was able to the table part but the histogram part was a little confusing...especially using statplus

Answer 19

I did a and b...c was a little problem child and so is d

Answer 20

the data looks good, can you plot the last column as a histogram

Answer 21

With statplus? I tried plugging in that data in frequency variables and that did nothing. I don't quite know how to manipulate statplus and have it spit out a histogram

Answer 22

a mean a relative frequency histogram

Answer 23

*I mean

Answer 24

for part (c) draw a histogram, use the 3rd column labeled frequency
for part (d) draw a histogram using the last column, labeled f/n

Answer 25

so for part c
would I highlight my column with the 55 different numbers and into "continuous variables"? where would the 3rd column go? how should I say this.... :S

Answer 26

are you saying that for part c I would plug column 3 into "continuous variables"?
http://assets.openstudy.com/updates/attachments/507c7400e4b040c161a25b3b-jennifersmart1-1350333588362-screenshot20121015at3.37.53pm.png

Answer 27

to be continued =)
I got to go. THanks for your help so far.

Answer 28

I think so, but I am not familiar with statplus. I assume it is a spread sheet.