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## AP®︎/College Statistics

### Course: AP®︎/College Statistics>Unit 1

Lesson 1: The language of variation: Variables

# Identifying individuals, variables and categorical variables in a data set

Identifying individuals, variables and categorical variables in a data set.

## Want to join the conversation?

• what does categorical mean
• It means the data in the set can be sorted into categories, in this case hot drinks and cold drinks. The sugar content, on the other hand, is not categorical, because a drink could have infinite different amounts of sugar.
Hope this helps!
• Why isn't the type of drink classified as a variable?
• It's not a variable because it's not describing anything or numbering anything. For example, "Type" is a categorial variable because it describes the heat of the drinks. "Sugars" is a quantitative variable because it numbers the amount of sugar in the drinks.
• What are the prerequisites for the Statistics and Probability course?
• Algebra is a must for any Statistics and Probability course.

Whether or not calculus is also required depends on how deeply the course goes into probability theory. If the course covers topics such as probability density functions of continuous random variables, cumulative distribution functions of continuous random variables, moment generating functions, and/or maximum likelihood estimators, then calculus would be required.
• what is standard deviation?
• Standard deviation is a measurement of the spread of the data. If you have a high standard deviation, that means your data are far away from the mean, while if it is low it means they are closer.
Hope this helps!
• I'm interested in learning about stats and probability however I have never learned about it in class. I've covered other math classes like algebra, advanced functions, calculus and a bit of linear algebra. Would this course be good for someone wanting to learn stats for fun? Or should I do other courses prior? Thanks!
• where can you find the "individuals" of set of data in a given table?
• An individual is what the data is describing. In a table like this, each individual is represented by one row. So in this case, the individuals would be the drinks. An example individual is cappuccino, which is a hot coffee that has 60 calories, 8 grams of sugar, and 75 milligrams of caffeine.
• okay, so categorial is more like something that describes it, like in this example, if the coffee is hot or cold. and quantitative is more like the caloric intake, the actual amounts with numbers?
• Typically quantitative (quantity) data are that of which that can be counted(or measured in various numerical values) while qualitative data (quality)is data specifies what type of data is ( i.e hot,cold, yellow, blue, red, low, high etc..) Be mindful on the data in the problem - all of it isn't relevant.
atleast that's what I got out of it......hopes this helps...
• Why are there no missions for statistics and probability? If there is, can you tell where?
• Khan Academy is getting rid of Missions in June 2020, so they have not been adding them to existing courses. If you are wondering about mastery challenges or practice problems, you should be able to access problems and quizzes either by assigning AP Statistics as one of your courses or by looking at the course overview here: https://www.khanacademy.org/math/ap-statistics/analyzing-categorical-ap
Hope this helps!