Summer Review Video 1 Flashcards
(20 cards)
What is Statistics
Statistics is the study of variability
What is variability
Variability is how things differ. In statistics we may study the differences in appearances, behavior, or preferences.
What are the two branches of statistics?
The two batches of statistics are descriptive and influential.
What are descriptive stats
Descriptive stats are when data is described in the form of numerical summaries such as mean, mode, median, and range as well as in charts and graphs.
What are influential stats
Influential statistics are when data is studied and then used to make an inference about the larger picture or the population.
Compare descriptive and influential stats
Descriptive statistics uses and explains data that has been collected, where as influential statistics uses data collected in a sample to make an inference and say something about a population.
What is data
Data is collected information. They are a group of individual pieces of information.
Ex. The data for who has cats vs. who has dogs would be: dog,dog,cat,dog,cat,cat, etc. Same with numbers collected for data.
What is the population?
The population is the group of interest o be studied
What is a sample
A sample is a portion of the population that can be selected at random or can be a specific portion of the population.
Compare population to sample
The population the the whole group of interest and are generally large whereas a sample is a portion of a population and is generally small. The data gathered from the sample is used to make an inference about the population.
Compare data to statistics
Data is individual pieces of gathered information where as a statistic is the numerical summary of a sample. Data must be collected and described in order to produce a valid statistic
Compare data to parameter.
The data are individual pieces of collected information where as a parameter is the numerical summary of the data collected from a population.
What is a parameter
A numerical summary of a population
What is a statistic
A statistic is the numerical summary of the data collected from a sample
What are Curious about the average wait time at sunken donuts drive through in your neighborhood. You randomly sample cars one afternoon and find that the average wait time is 3.2 minutes. What is the population? What is the population parameter? What is the statistic? What is the parameter of interest? What is the data?
The population is everyone in my neighborhood. The population parameter will not be an accurate amount because the entire population was not surveyed. The population parameter which is a numerical summary of the entire wait times of everyone in the neighborhood, will be determined by making an infernale based on the statistic which is 3.2 minutes. The parameter of interest is the average wait time of everyone in the neighborhood. The data is the specific amount of time each person who participated in the sample waited in line at the Dunkin’ Donuts drive through.
Compare Data statistic and parameter using categorical examples
Favorite Harry Potter Characters:
Data: harry, harry, harry, Ron, hermione, hermione,
Statistic: 70% of the sample preferred hermione as their favorite character
Parameter: 50% of the population preferred hermine as their favorite character
Compare date statistics and parameter using quantitive examples
Mile Time:
Date: 8mins, 7mins, 11 mins, 10 mins, 7 mins
Statistic: the average time taken to complete a mile of the sample is 8 minutes
Parameter: the average time to complete a mile of the population is 8 minutes
What is a census
A census is a sample of an entire population. A census is best used when the population is small.
Does a census make sense
A census makes sense with a small group as the population such as a family , unlike the whole entire US
What is the difference between a parameter and a statistic?
A parameter and a statistic are a numerical summery. The only difference is the parameter is based on a population and a statistic is based on a sample. A statistic can be used to infer a parameter.
