In this video you will learn how to create a frequency table.

Transcript.

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In this video I would like to go over the steps for creating a frequency table.

A frequency table organizes data into categories to show the frequency of each. You can think of frequency as how often something occurs.

Step 1 - Determine your intervals (four to seven different

intervals is ideal).

Step 2 - Draw your frequency table.

Step 3 - Tally the data in each interval.

Intervals must be:

* Equal

* Non-overlapping

*Able to contain all of the data points

What does this mean? If your data ranges from 2 to 38:

DO THIS: NOT THIS:

1-10, 11-20, 21-30, 31-40 1-10, 10-20, 20-30, 30-40 (overlaps)

1-8, 9-16, 17-24, 25-32, 33-40 1-10, 11-15, 16-35, 36-40 (unequal)

Finally, looks good, but it only goes to 30, and your data goes to 39

1-10, 11-20, 21-30 (doesn‛t include

all data)

Lets get started on a frequency table, and here is our prompt.

The list shows the average high temperatures for 20 cities on one March day. Make a frequency table of the data.

Lets next go over what is actually in the frequency table.

Quickly point out some highlights.

First you have an overall title of the table

You then have a column for your intervals and you have a title of the column.

You have a tallies column, and then a frequency column.

Each frequency table in some way should have these ingredients.

Now the data is set in descending order so step one is to determine your intervals.

Start with the lows and you go between the range of the low of 2 and the high of 69

I know I want four intervals so I will round down to zero and up to 80.

I know 80 divided by 4 equals 20

Notice I have the tables set up so there is not any overlap and 0-19 and no overlap, and then 20-39 then 40-59,60-79, they also include the entire data set.

I next start doing tallies.

The easiest thing to do with a frequency table is to make mistakes and leave out numbers to help prevent this complete a check then a tallie.

69 then a tallie, 66 tallie,65,then 51,50 and Im in a different row, 50,50, 44,41,38,32,28,20,18,12,8,8,4,2,2 I continue this for all of the numbers.

If you want to be careful you can count the tallies and make sure they match the tallies.

I count 20, so I know I have completed all of the numbers.

I then total my frequency and I have 7 and 5 and 5 and this is 3.There we go on how to create a frequency table.

I also created a video on how to create a cumulative frequency table.

Thanks for watching.

MooMooMath uploads a new Math video everyday.

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Tagged under: frequency table,data table,middle school math,6th grade math

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