1What is a Sample?
A sample is an unbiased subset of the population that represents the whole data.
2What is a Population?
A population is the entire set of items you draw data from.
3What is the difference between a Sample and Population?
A population is the full set of data. A sample is subset of the full set of data used to represent the full set of data.
A population is the pie. A sample is a slice of it.
4What is a Statistic?
A Statistic is something that describes a sample of a population.
60% of all pizzas made have at least 10 slices of pepperoni. (They probably only surveyed a fraction or Sample of pizzas.)
5What is a Parameter?
A Parameter is something describing the entirety of a population.
30% of this pizza has pepperoni. (Describes the entire population of the pizza.)
6What is the difference between a Statistic and a Parameter?
A Parameter describes an entire population. A Statistic describes a Sample.
7What is a Categorical/Qualitative variable?
A Categorical variable are variables that have names or labels.
Favorite ice cream flavor (vanilla, chocolate, in denial)
8What is a Nominal variable
A Nominal variable is a type of Categorical variable that separates data into categories without rank.
Type of animal(fish, mammal, reptile, avian)
9What is an Ordinal variable?
An Ordinal variable is a type of Categorical variable that separates data into categories with order or rank.
Income(High, medium-high, medium, low, revolutionary)
10What is a Numeric/Quantitative variable?
A Numeric/Quantitative variable are variables that have numbers.
GPA (4, 3, 2.5, unemployed)
11What is a Discrete variable?
A Continuous variable is a type of Numeric variable that can have distinct, countable values. They can be counted, not measured.
Goals in a soccer math
M&M's in a jar
12What is a Continuous variable?
A Continuous variable is a type of Numeric variable that can take on any value within a range, and can take provide a nearly infinite number of values in that range.
The exact mph a soccer ball is kicked at
The amount of cacao in a jar of M&M's
13What is a Binary/Boolean variable?
A Binary/Boolean variable is a variable with only two values. They can be Numeric or Categorical.
Passing class (Yes/No)
Hours of sleep (1/0)
14What does it mean if a distribution is Skewed Left?
If a distribution is Skewed Left, it's tail is on the Left of the graph.
Its Mean is less than the Median.
15What does it mean if a distribution is Skewed Right?
If a distribution is Skewed Right, it's tail is on the Right of the graph.
Its Mean is greater than the Median.
16What does it mean if a distribution is Symmetric?
If a distribution is Skewed Left, it's symmetrical on both sides and doesn't skew to either direction.
Its Mean is equal to the Median.
17What does it mean if a distribution is Unimodal?
If a distribution is Unimodal a distribution that has one peak.
18What does it mean if a distribution is Bimodal?
If a distribution is Bimodal a Multimodal distribution that has two peaks.
19What does it mean if a distribution is Multimodal?
If a distribution is Multimodal a distribution with more than one peak.
20What is a Type I error?
A Type I error is when you reject a null hypothesus despite it being true.
21What is a Type II error?
A Type I error is when you fail to reject a null hypothesus despite it being false.