# Difference between revisions of "AP Statistics Curriculum 2007 EDA Freq"

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===Definitions=== | ===Definitions=== | ||

* A '''frequency distribution''' is a display of the number (frequency) of occurrences of each value in a data set. | * A '''frequency distribution''' is a display of the number (frequency) of occurrences of each value in a data set. | ||

− | * A '''relative frequency''' distribution is a display of the | + | * A '''relative frequency''' distribution is a display of the percentage (ratio or frequency to sample-size) of occurrences of each value in a data set. |

+ | * A [http://en.wikipedia.org/wiki/Percentile percentile] is the <u>value</u> of a variable that divides the real line into two segments - the left one containing certain percentage (say 13%) of the observations for the specific process, and the right interval containing the complementary percentage of observations (in this case 87%). The 30<sup>th</sup> percentile is the value (measurement) bound above 30% and below 70% of the observations from a process. | ||

+ | * The (three) '''quartiles''' are the special cases of percentiles for Q<sub>1</sub>=25%, Q<sub>2</sub>=50% (median) and Q<sub>3</sub>=75%. | ||

===Example=== | ===Example=== | ||

− | + | The table below shows the stage of disease at diagnosis of breast cancer in a random sample of 2092 US women. | |

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===Computational Resources: Internet-based SOCR Tools=== | ===Computational Resources: Internet-based SOCR Tools=== | ||

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===Hands-on activities=== | ===Hands-on activities=== | ||

− | You can copy the first 2 columns in the data table above | + | You can copy and paste the first 2 columns in the data table above in the [http://socr.umich.edu/html/cha/ SOCR Charts] (BarChart --> XYPlot --> HistogramDemo7). You can see [[SOCR_EduMaterials_Activities_Histogram_Graphs | this SOCR Charts activity]] for help with histogram plots. |

* The graph below illustrates the (raw) frequency histogram (using counts) | * The graph below illustrates the (raw) frequency histogram (using counts) | ||

<center>[[Image:SOCR_EBook_Dinov_EDA_012708_Fig1.jpg|500px]]</center> | <center>[[Image:SOCR_EBook_Dinov_EDA_012708_Fig1.jpg|500px]]</center> | ||

− | * The graph below | + | * The graph below shows the relative frequency histogram (using the last column of the table above). |

<center>[[Image:SOCR_EBook_Dinov_EDA_012708_Fig2.jpg|500px]]</center> | <center>[[Image:SOCR_EBook_Dinov_EDA_012708_Fig2.jpg|500px]]</center> | ||

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+ | ===[[EBook_Problems_EDA_Freq | Problems]]=== | ||

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− | * SOCR Home page: http://www.socr. | + | * SOCR Home page: http://www.socr.umich.edu |

− | {{translate|pageName=http://wiki. | + | {{translate|pageName=http://wiki.socr.umich.edu/index.php?title=AP_Statistics_Curriculum_2007_EDA_Freq}} |

## Latest revision as of 12:10, 6 March 2014

## Contents

## General Advance-Placement (AP) Statistics Curriculum - Summarizing data with Frequency Tables

### Summarizing data with Frequency Tables & Histograms

There are two ways to describe a data set (sample from a population) - Pictorial Graphs or Tables of Numbers. Both are important for analyzing data.

### Definitions

- A
**frequency distribution**is a display of the number (frequency) of occurrences of each value in a data set. - A
**relative frequency**distribution is a display of the percentage (ratio or frequency to sample-size) of occurrences of each value in a data set. - A percentile is the
__value__of a variable that divides the real line into two segments - the left one containing certain percentage (say 13%) of the observations for the specific process, and the right interval containing the complementary percentage of observations (in this case 87%). The 30^{th}percentile is the value (measurement) bound above 30% and below 70% of the observations from a process. - The (three)
**quartiles**are the special cases of percentiles for Q_{1}=25%, Q_{2}=50% (median) and Q_{3}=75%.

### Example

The table below shows the stage of disease at diagnosis of breast cancer in a random sample of 2092 US women.

Stage | Frequency | Relative Frequency |
---|---|---|

0 | 197 | 0.09 |

I | 691 | 0.33 |

II | 703 | 0.34 |

III | 314 | 0.15 |

IV | 187 | 0.09 |

Total | 2092 | 1.00 |

### Computational Resources: Internet-based SOCR Tools

- SOCR Charts allows you to generate graphical representations (including frequency histograms) of a variety of datasets.
- The SOCR Charts activities provide usage-instructions, examples and demonstrations of how to use SOCR Charts.

### Hands-on activities

You can copy and paste the first 2 columns in the data table above in the SOCR Charts (BarChart --> XYPlot --> HistogramDemo7). You can see this SOCR Charts activity for help with histogram plots.

- The graph below illustrates the (raw) frequency histogram (using counts)

- The graph below shows the relative frequency histogram (using the last column of the table above).

### Problems

### References

- SOCR Home page: http://www.socr.umich.edu

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