What is a parameter?
Choose an option to check your answer.
Parameters describe populations, such as a population mean or proportion.
They are often unknown and estimated using sample statistics.
Practice USAT Statistics questions with answers and explanations.
Choose an option to check your answer.
Parameters describe populations, such as a population mean or proportion.
They are often unknown and estimated using sample statistics.
Choose an option to check your answer.
A statistic summarizes observed sample data.
It may be used to estimate a corresponding population parameter.
Choose an option to check your answer.
Qualitative variables describe categories rather than numerical amounts.
Blood groups such as A, B, AB, and O are categories.
Choose an option to check your answer.
A discrete variable takes countable values, usually integers.
The number of students cannot meaningfully take fractional values.
Choose an option to check your answer.
Continuous variables can take any value within an interval.
Weight can be measured to increasingly fine precision.
Choose an option to check your answer.
Nominal data classify observations without ranking them.
Examples include blood group and marital status.
Choose an option to check your answer.
Ordinal data preserve order among categories.
The gaps between successive categories need not be equal.
Choose an option to check your answer.
Interval scales support meaningful differences between values.
Temperature in degrees Celsius has no true absence point.
Choose an option to check your answer.
A population contains every unit about which conclusions are desired.
A sample is selected from the population for practical study.
Choose an option to check your answer.
A sample provides information about a larger population.
Good sampling methods aim to make it representative.