Types of data
A random variable X, representing the number of students in classes at AHS, represents this kind of numerical data.
Discrete
A researcher stands outside a local library and surveys the first 50 people who walk through the door about their reading habits.
Convenience Sampling
Systematic error that results in certain outcomes being favored over others.
bias
The value found by subtracting the lower quartile Q_1
from the upper quartile Q_3 .
IQR
Inter-quartile range
A random variable X, representing the favorite color of survey participants, represents this kind of data.
Categorical
Selecting every nth member from a list or a line.
Systematic random sampling
This Sampling method is not random because the researcher simply picks people until the categories are filled.
After removing the outlier from the set {11, 12, 14, 15, 18, 45}, the median is ___
14
Not the sample, but the entire group
population
The researcher surveys selected classrooms during 3B
Cluster sampling
The term for organizing and describing the characteristics of a group, rather than making predictions.
Descriptive statistics
The specific formula for the Upper Boundary of outliers is this.
Q_3+1.5 * IQR
This is the basic difference between discrete and continuous data.
discrete data is counted, continuous data is measured
answers may vary slightly
In a population of 1,000 with 200 seniors, the number of seniors needed for a stratified sample of 50 is this
10
explanation
200/1000=n/50
This is how consistent a measurement is
Reliability
Of the Mean and the Median, the measure of central tendency that is not affected by outliers.
Median
A random variable R represents the room number of a student's 1A class. This represents what kind of data?
Categorical
Every member of the population has an equal chance of being selected, and every possible group of size n is be equally likely to be chosen.
Simple Random Sampling
Attempting to describe the heights of high school students by measuring the basketball team fails because the sample is not _________________
representative
In a data set with a very high outlier, the Mean will be _________ than the Median.
higher, greater, bigger, larger
etc