# AP Statistics Curriculum 2007 EDA Pics

### From Socr

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===Pictures of Data=== | ===Pictures of Data=== | ||

- | + | There are a [[SOCR_EduMaterials_ChartsActivities | varieties of graphs and plots]] that may be used to display data. | |

- | < | + | * For '''quantitative''' variables, we need to make classes (meaningful intervals) first. To accomplish this we need to separate (or bin) the quantitative data into classes. |

+ | * For qualitative variables we need to use the frequency counts, instead of the native measurements as the latter may not even have a natural ordering (so binning the variables in classes may not be possible). | ||

+ | * How to define the number of bins or classes? One common rule of thumb is that the number of classes should be close to <math>\sqrt{sample-size}</math>. For accurate interpretation of data, it is important that all classes (or bins) are of equal width. Once we have our classes we can create a frequency/relative frequency table or histogram. | ||

- | === | + | ===Example=== |

- | + | People who are concerned about their health may prefer hot dogs that are low in salt and calories. The [[SOCR_012708_ID_Data_HotDogs | Hot dogs datafile]] contains data on the ''sodium'' and ''calories'' contained in each of 54 major hot dog brands. The hot dogs are also classified by type: ''beef'', ''poultry'', and ''meat'' (mostly pork and beef, but up to 15% poultry meat). For now we will focus on the calories of these sampled hotdogs. | |

- | * | + | * Using [http://socr.ucla.edu/htmls/SOCR_Charts.html SOCR Charts] and the [[SOCR_EduMaterials_ChartsActivities | Charts activities]] you can produce a number of interesting graphical summaries for [[SOCR_012708_ID_Data_HotDogs | this hotdogs dataset]]. |

- | + | * The histogram of the '''Calory''' content of all hotdogs in shown in the image below. Note the clear separation of the calories into 3 distinct sub-populations. Could this be related to the type of meat in the hotdogs? | |

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- | * | + | <center>[[Image:SSOCR_EBook_Dinov_EDA_012708_Fig3.jpg|500px]]</center> |

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+ | * The histogram of the '''Sodium''' content of all hotdogs in shown in the image below. What patterns in this histogram can you identify? Try to explain! | ||

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+ | <center>[[Image:SSOCR_EBook_Dinov_EDA_012708_Fig4.jpg|500px]]</center> | ||

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

* TBD | * TBD | ||

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===References=== | ===References=== |

## Revision as of 20:29, 27 January 2008

## Contents |

## General Advance-Placement (AP) Statistics Curriculum - Pictures of Data

### Pictures of Data

There are a varieties of graphs and plots that may be used to display data.

- For
**quantitative**variables, we need to make classes (meaningful intervals) first. To accomplish this we need to separate (or bin) the quantitative data into classes. - For qualitative variables we need to use the frequency counts, instead of the native measurements as the latter may not even have a natural ordering (so binning the variables in classes may not be possible).
- How to define the number of bins or classes? One common rule of thumb is that the number of classes should be close to . For accurate interpretation of data, it is important that all classes (or bins) are of equal width. Once we have our classes we can create a frequency/relative frequency table or histogram.

### Example

People who are concerned about their health may prefer hot dogs that are low in salt and calories. The Hot dogs datafile contains data on the *sodium* and *calories* contained in each of 54 major hot dog brands. The hot dogs are also classified by type: *beef*, *poultry*, and *meat* (mostly pork and beef, but up to 15% poultry meat). For now we will focus on the calories of these sampled hotdogs.

- Using SOCR Charts and the Charts activities you can produce a number of interesting graphical summaries for this hotdogs dataset.

- The histogram of the
**Calory**content of all hotdogs in shown in the image below. Note the clear separation of the calories into 3 distinct sub-populations. Could this be related to the type of meat in the hotdogs?

- The histogram of the
**Sodium**content of all hotdogs in shown in the image below. What patterns in this histogram can you identify? Try to explain!

### Computational Resources: Internet-based SOCR Tools

- TBD

### References

- TBD

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

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