What is the difference between a variable, a value, and a score?
Variable: characteristic measured; Value: possible category/number a variable can take; Score: a specific person’s value on a variable.
What is the difference between descriptive and inferential statistics?
Descriptive statistics summarize observed data; Inferential statistics use sample data to make predictions or generalizations about a population.
What is the difference between quantitative and qualitative variables?
Quantitative variables are numeric and represent amounts; Qualitative variables are categorical and represent labels or groups.
Which level of measurement (nominal, ordinal, or interval) best depicts the variable Weight? Hint: Choose the highest level of measurement that works.
Interval (often treated as ratio): weight has equal intervals and a true zero, allowing meaningful differences and ratios.
Provide an example of a variable that can only be measured at the nominal level.
Blood type.
What is the difference between a frequency table and a histogram?
A frequency table shows counts in rows/columns; A histogram is a graph showing frequencies with adjacent bars for numeric data.
What does it mean when a distribution is bimodal?
It has two distinct peaks (two most frequent values or ranges).
What is a symmetrical distribution?
Left and right sides are mirror images around the center.
What is a non-symmetrical (skewed) distribution?
One side is longer or stretched out; data cluster more on one side of the distribution.
