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The following data are the numbers of digits per foot in 25 guinea pigs. Construct a frequency distribution for these data. $$4,4,4,5,3,4,3,4,4,5,4,4,3,2,4,4,5,6,4,4,3,4,4,4,5$$

Short Answer

Expert verified
The frequency distribution table shows 2:1, 3:4, 4:13, 5:5, 6:1.

Step by step solution

01

Organize the Data

First, list all the given data points: 4, 4, 4, 5, 3, 4, 3, 4, 4, 5, 4, 4, 3, 2, 4, 4, 5, 6, 4, 4, 3, 4, 4, 4, 5. This step helps you visualize the numbers and prepare them for counting.
02

Identify the Range of Data

Identify the smallest and largest values in the dataset. Here, the smallest value is 2 and the largest is 6, so our range will be from 2 to 6 (inclusive).
03

Create Categories for Frequency

Create categories (sometimes called classes) for every integer value between the smallest and largest value, which are 2, 3, 4, 5, and 6.
04

Count for Each Category

Count how many times each value appears in the dataset. - Number 2: 1 occurrence - Number 3: 4 occurrences - Number 4: 13 occurrences - Number 5: 5 occurrences - Number 6: 1 occurrence.
05

Construct the Frequency Distribution Table

Create a frequency distribution table with the categories and corresponding frequency. \[\begin{array}{|c|c|}\hline\text{Number of Digits} & \text{Frequency} \\hline2 & 1 \3 & 4 \4 & 13 \5 & 5 \6 & 1 \\hline\end{array}\]

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Data Range
When you come across a dataset like the number of digits per foot in 25 guinea pigs, the first step in creating a frequency distribution is identifying the data range. The range helps in determining the span of your categories. To find the data range, you need to look for the smallest and largest numbers present in the dataset. Here, the data points are the numbers of digits, with 2 being the smallest and 6 being the largest. This means your data range is from 2 to 6. The range is crucial for defining how you will organize the data into categories or classes. Knowing the extent of your data ensures that every data point is accounted for in the frequency table. In this exercise, having a clear range simplifies setting up categories, as every category corresponds to an integer within this range.
Frequency Table
A frequency table is a tool that allows you to neatly display how often different values occur in your dataset. After identifying the data range, you set up categories or bins that will hold these values. For our guinea pig example, the categories are each integer from the smallest number to the largest, which are 2, 3, 4, 5, and 6. Once you count how many times each number appears, you record these counts in the table. Make sure each category covers a single number in this case, as we're dealing with discrete data. This approach ensures that no data point goes unnoticed. The frequency table not only helps you identify patterns within your data but makes it easier to visualize and analyze the dataset at a glance. It clearly and concisely presents the data, highlighting which numbers are most and least common.
Data Organization
Data organization is all about structuring your information in a way that makes it easy to understand and analyze. Initially, like in our exercise, you start by listing all data points in an organized manner. This step might seem simple, but it's foundational. By listing the data, you start recognizing patterns and prepare it for further analysis. It greatly helps in reducing errors you might make when creating the frequency table, as you're less likely to miss a number when they're clearly organized in front of you. This organized list acts as a stepping stone to further steps, like counting occurrences. It's also a good time to double-check your listing to ensure accuracy before moving on to creating categories and counting the occurrences.
Counting Occurrences
Once your data is organized and you've identified your range, the next crucial step is counting occurrences. This might sound simple, but it's a critical part of making a frequency distribution. For each category or class (integers in this case), you count how many times each appears in your dataset. This is where attention to detail really matters. For our guinea pig data, you'd count how many times 2, 3, 4, 5, and 6 appeared. You record these numbers to later form your frequency table. For instance, number 4 appears 13 times, showing it's the most common number of digits. Counting correctly ensures your frequency distribution accurately reflects the dataset, providing meaningful insights into the data's structure and characteristics.

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