Data
This describes a distribution whose longer tail stretches to the right.
What is skewed right?
This is the measure of center used with the normal model.
What is the mean?
This is the numerical direction and strength of a linear association.
What is the correlation coefficient?
The population is divided into groups based on some characteristic, then take a random sample from each group
What is stratified random sampling?
Neither the subjects nor the people in contact with them know which treatment is being given.
What is double-blind?
This graph uses adjacent bars to show the distribution of values in a quantitative variable. Each bar represents the number of values in that interval.
What is a histogram?
This indicates how many standard deviations a data value is from the mean.
What is a z-score?
This is the difference between the actual data value and the value predicted by a model.
What is a residual?
This is a systematic failure of a sampling method to represent a population.
What is bias?
It uses data for which no treatments have been assigned to subjects.
What is an observational study?
This graph shows equal-sized bars divided into sections corresponding to the percentages found in individual categories.
What is a segmented bar chart?
This rule indicates what percentage of data fall within one, two, and three standard deviations of the mean.
What is the 68-95-99.7 Rule (...or the Empirical Rule)?
When this data point is omitted, the slope of the regression line is significantly different.
What is an influential point?
The population is divided into groups, several groups are randomly chosen.
What is Cluster Sampling?
This is a treatment with no known effect that is administered so all groups experience the same conditions.
What is a placebo?
This graph displays the distribution as well as individual quantitative data values.
What is a stem-and-leaf plot?
This scatterplot is used to assess whether a data distribution is approximately Normal.
What is a Normal probability plot?
This is making predictions using explanatory values that are far from those used to create the linear model.
What is extrapolation?
This sampling method gives each possible combination of population members an equal chance of selection.
What is a simple random sample?
These are the four principles of experiments.
What are Comparison, Randomization, Control and Replication?
This graph uses the five-number summary to display the distribution of quantitative data.
What is a boxplot?
It is the Normal model whose mean is 0 and standard deviation is 1.
What is the standard Normal model?
A data point whose x-value is far from the mean of all the x-values have a high amount of this.
What is leverage?
This type of bias is problematic because inaccurate or false information is provided.
What is response bias?
This is when an uncontrolled variable is associated with the explanatory variable such that their effects cannot be separated.
What is a confounding variable?