-
What sampling method is used?
A statistician who makes a research on automobile performance collects
information on American, Japanese, and European automobiles separately
to combine the results in the end.
Stratified
-
What sampling method is used?
An inspector team from
Department of Education needs to inspect middle schools in a large
city. They choose at random 10 schools and then come to each of them to
inspect each class.
Cluster
-
What sampling method is used?
An inspector came to a public
school to survey the teachers. She comes to the teacher lounge during
the lunch break and talks with every present teacher.
Convenience
-
What sampling method is used?
A quality control manager picks every 100th soda can, opens it and measures the amount of drink in it.
Systematic
-
Is this an observational or an experimental study?
A farmer applies several new fertilizers to fruit trees to find out which of them is the most efficient.
Experimental
-
Is this an observational or an experimental study?
A zoologist counts the bees visiting a rose bush during a 3 - hour period.
Observational
-
What level of measurement is this?
The letter grades: A, B, C, D, F.
Ordinal
The data can be arranged in a logical order, but the intervals between them cannot be definded.
-
What level of measurement is this?
The number of passengers in a bus.
Ratio
We can compare the numbers of passengers in different buses by dividing one by the other.
-
What level of measurement is this?
Your age.
Ratio
We can compare two person's ages by dividing one by the other.
-
What level of measurement is this
Your year of birth.
Interval
- Years of birth can be compared by subtraction but
- not by division, since there is no natural zero. (Each calendar has it
- different.)
-
What level of measurement is this?
Numerical equivalents of school grades (4 for A, 3 for b, 2 for C etc.)
Interval
Grades can be compared by subtraction, but dividing them by each other makes no sense.
-
What level of measurement is this?
The number of teeth in an animals's mouth
Ratio
We can compare the numbers of teeth by dividing one by the other.
-
What level of measurement is this?
A car's maximum speed.
Ratio
We can compare two car's maximum speeds by dividing one by the other.
-
What level of measurement is this?
A girl's hair color.
Nominal
Colors are always at the nominal level.
-
What level of measurement is this?
Your e-mail address
What level of measurement is this?
Your e-mail address
-
What level of measurement is this?
Condition of a knife (sharp, dull, jagged).
Ordinal
The data can be arranged in a logical order, but the intervals between them cannot be defined.
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