Individuality
The entire group of individuals in a statistical study.
What is population?
Takes values that are labels, which place each individual into one of several groups, such as hair color or birth month.
What is categorical?
Equals Q3 - Q1
What is the interquartile range?
Shows relationship between 2 quantitative variables measured on the same individual. Each individual in the data set appears as a point on the graph.
What is a scatterplot?
Consists of individuals from the population who are easy to reach.
What is convenience sample?
A subset of individuals in the population from which data is collected.
What is a sample?
Numerical values that count or measure some characteristic of each individual, such as number of family members or height in centimeters.
What is a quantitative variable?
Percent of values in a distribution that are less than an individuals data value.
What is percentile?
Measure of a strength and direction of a linear relationship between two quantitative variables.
What is a correlation?
Some subjects in an experiment will respond favorably to any treatment, even an inactive treatment.
What is placebo effect?
Measures variables of interest, but does not attempt to influence responses.
What is an observational study?
Describes the values the variable takes and how often it takes them.
What is a distribution?
When the distribution is skewed to the right the ___ is located to the right of the ___ in the distribution.
What are the mean and median?
The values of a correlation range from __ to __.
What are -1 and 1?
Consists of people who volunteer to be in a sample by responding to a general invitation.
What is a voluntary response variable?
Deliberately imposes treatment on individuals to measure their responses.
What is an experiment?
These two charts are used to display categorical data.
What are bar and pie charts?
Describes the approximate percentages of values that fall within 1, 2, and 3 standard deviations of the mean.
What is the Empirical Rule?
Values in a correlation close to zero indicate a ____ correlation.
What is weak?
The difference between these two types of bias is that one occurs when the individuals in the sample can't be contacted or refuse to respond and the other occurs when the individuals of the population are less likely to be chosen for the sample.
What are undercoverage and nonresponse?
1. Asking questions
2. Collecting Data
3. Analyzing Data
4. Interpreting Data
What is a statistical process?
3 ways to display quantitative data
What are dotplot, stemplot, and histogram?
Measures how many standard deviations the data value lies above or below the mean of the distribution.
What is z-score?
The 4 things used to describe a scatterplot.
What are form, direction, strength, and outliers?
Consists of individuals from the population who are selected for the sample using a chance process.
What is random sample?