Data Types
Type of variable that is typically an integer representing a count of objects
Discrete
Type of sample that involves a newspaper, online website, or standing at the exit of the lunchroom
Convenience sample
The study of collecting, sorting, analyzing, and interpreting data
Statistics
Find the mean:
{24, 56, 37, 17, 3, 8, 90, 49}
35.5
Where does the mean exist in a normal distribution?
Middle/center
The type of variable that uses words or labels
Nominal
Type of sample that involves separating population into clusters and selecting random members from each cluster
Stratified random sample
_________ data is organized, typically by rows and columns of a table.
Structured
Find the median:
{24, 56, 37, 17, 3, 8, 90, 49}
30.5
In a normal distribution, 99.7% of all data exists within how many standard deviations of the mean?
Three
Temperature can be classified by what type of variable?
Continuous
The type of sample that is the ideal, where each member of the population has an equal likelihood of being selected
Simple random sample
The measure of spread used in a skewed distribution
IQR
Find the upper quartile:
{24, 56, 37, 17, 3, 8, 90, 49}
52.5
___% of data in a normal distribution exists between z-scores of -2 and 2.
95
The number of students in this class would be classified as what type of variable?
Discrete
Type of sample in which individuals volunteer themselves to take part
Self-selected sample
Unfairly in favor/against one thing, person, or group compared with another
Bias
Find the IQR:
{24, 56, 37, 17, 3, 8, 90, 49}
40
Find "x" (to the nearest tenth), given:
z-score = -2.2
Pop. Mean = 100
St. Dev. = 1.5
96.7
Classroom numbers would be considered what type of variable?
Ordinal
A sample in which members are selected according to a rule, such as every 5th person
Systematic sample
A graphical display of quantitative data
Histogram
In RStudio, what code would be used to calculate the median age of all bikers from the "bike" dataset?
median(bike$age)
How old is Mr. Ellery? (to the nearest tenth of a year)
33.3