Tally Charts & Frequency Tables Flashcards

All 6 cards in this deck

What is a tally chart used for?

Recording how often each category or value occurs as data is collected.

How is the fifth item recorded in a tally?

As a diagonal stroke across the previous four, making a group of five.

What are the steps to complete a frequency table from a list of raw data?
e.g. red, blue, red, red, blue

1. Go through the list once, putting a tally mark by each item: red $|||$, blue $||$
2. Count each row's tally marks to get the frequency: red 3, blue 2
3. Add the frequencies to check the total matches the amount of data: $3+2=5$

What does the total of the frequency column tell you?

The total number of items (observations) in the data set.

What is a two-way table?

A table showing two variables at once — one down the rows, one across the columns — usually with row, column and overall totals.

True or false? The classes in a grouped frequency table may overlap.

False.
Classes must not overlap, so every value fits in exactly one class.