STATISTICS EXAMPREP BUNDLED EXAMS
LATEST KNOWLEDGE CHECK WITH VERIFIED
A+ SOLUTIONS AND SCENARIOS
◉Are data at the nominal level of measurement quantitative or
qualitative? Answer: qualitative
◉What is the difference between a parameter and a statistic? Answer: A
parameter is a numerical measurement describing data from a
population. A statistic is a numerical measurement describing data from
a sample.
◉For a set population, does a parameter ever change? Answer: never
◉If there are three different samples of the same size from a set
population, is it possible to get three different values for the same
statistic? Answer: Data from samples may vary from sample to sample,
and so corresponding sample statistics may vary from sample to sample.
◉(a) Consider these number assignments for category items describing
electronic ways of expressing personal opinions.
1 = Twitter; 2 = e-mail; 3 = text message; 4 = Facebook; 5 = blog
, Are these numerical assignments at the ordinal data level or higher?
Explain. Answer: No, they are at the nominal level as there is no
apparent ordering in the responses.
◉(b) Consider these number assignments for category items describing
usefulness of customer service.
1 = not helpful; 2 = somewhat helpful; 3 = very helpful; 4 = extremely
helpful
Are these numerical assignments at the ordinal data level? Explain.
Answer: Yes, the data has an ordering to its categories.
◉What about at the interval level or higher? Explain. Answer: No,
while the data has an ordering, and the data can be compared to each
other, the differences don't mean anything.
◉What is the average miles per gallon (mpg) for all new hybrid small
cars? Using Consumer Reports, a random sample of such vehicles gave
an average of 35.7 mpg.
1) Identify the variable.
2) Is the variable quantitative or qualitative?
3) What is the implied population? Answer: 1) miles per gallon
2) quantitative
3) all new hybrid small cars
LATEST KNOWLEDGE CHECK WITH VERIFIED
A+ SOLUTIONS AND SCENARIOS
◉Are data at the nominal level of measurement quantitative or
qualitative? Answer: qualitative
◉What is the difference between a parameter and a statistic? Answer: A
parameter is a numerical measurement describing data from a
population. A statistic is a numerical measurement describing data from
a sample.
◉For a set population, does a parameter ever change? Answer: never
◉If there are three different samples of the same size from a set
population, is it possible to get three different values for the same
statistic? Answer: Data from samples may vary from sample to sample,
and so corresponding sample statistics may vary from sample to sample.
◉(a) Consider these number assignments for category items describing
electronic ways of expressing personal opinions.
1 = Twitter; 2 = e-mail; 3 = text message; 4 = Facebook; 5 = blog
, Are these numerical assignments at the ordinal data level or higher?
Explain. Answer: No, they are at the nominal level as there is no
apparent ordering in the responses.
◉(b) Consider these number assignments for category items describing
usefulness of customer service.
1 = not helpful; 2 = somewhat helpful; 3 = very helpful; 4 = extremely
helpful
Are these numerical assignments at the ordinal data level? Explain.
Answer: Yes, the data has an ordering to its categories.
◉What about at the interval level or higher? Explain. Answer: No,
while the data has an ordering, and the data can be compared to each
other, the differences don't mean anything.
◉What is the average miles per gallon (mpg) for all new hybrid small
cars? Using Consumer Reports, a random sample of such vehicles gave
an average of 35.7 mpg.
1) Identify the variable.
2) Is the variable quantitative or qualitative?
3) What is the implied population? Answer: 1) miles per gallon
2) quantitative
3) all new hybrid small cars
