STA 2023 - Chapter 1
Exam Questions and
Complete Solutions
Graded A+
Data - Answer: collections of observations (measurements, genders, or survey responses)
Statistics - Answer: the science of planning studies and experiments; obtaining data; then putting it all
together (organize, summarize, present, analyze, and interpret data); draw conclusion
Population - Answer: complete collection of all measurements or data that are being considered.
Typically a population is the complete collection of data that we would like to analyze
census - Answer: the collection of data from every member of the population
sample - Answer: sub collection of members selected from a population
Voluntary response sample - Answer: one in which the respondents decided if they want to be included
-- by their nature are flawed due to strong possible bias
Statistical significance - Answer: is achieved in a study when we get a result that is very unlikely to occur
by chance. A common criteria is that we have statistical significance if the likelihood of an event
occurring by chance is 5% or less
Practical significance - Answer: it is possible that some treatment or finding is effective, but common
sense might suggest that the treatment or finding does not make enough of a difference to justify its use
or be practical
Exam Questions and
Complete Solutions
Graded A+
Data - Answer: collections of observations (measurements, genders, or survey responses)
Statistics - Answer: the science of planning studies and experiments; obtaining data; then putting it all
together (organize, summarize, present, analyze, and interpret data); draw conclusion
Population - Answer: complete collection of all measurements or data that are being considered.
Typically a population is the complete collection of data that we would like to analyze
census - Answer: the collection of data from every member of the population
sample - Answer: sub collection of members selected from a population
Voluntary response sample - Answer: one in which the respondents decided if they want to be included
-- by their nature are flawed due to strong possible bias
Statistical significance - Answer: is achieved in a study when we get a result that is very unlikely to occur
by chance. A common criteria is that we have statistical significance if the likelihood of an event
occurring by chance is 5% or less
Practical significance - Answer: it is possible that some treatment or finding is effective, but common
sense might suggest that the treatment or finding does not make enough of a difference to justify its use
or be practical
