Statistics SNHU, Hart, Wiley+
Census - answer survey of a whole population. For example, the U.S. Census.
Censuses can be very expensive and time-consuming, if the population is large.
sample survey - answer takes a fraction of the population. Sample surveys are cheaper
than censuses, but are not as accurate. Bias can also be an issue
experiment - answer is a controlled study of a group. Experiments are very common in
the medical fields. The researcher controls how members are placed study groups and
which treatment each group receives. Bias can be a major issue with experiments.
observational study - answer is about the same as an experiment. However, the
researcher does not use control groups or assign treatments.
Statistics - answer science of collecting, describing, and analyzing data
cases or units - answersubjects/objects that we obtain information about
variable - answerany characteristic that is recorded for each case
quantitative variable - answermeasures or records a numerical quantity for each case
categorical variable - answerqualitative. values that are names or labels. The color of a
ball (e.g., red, green, blue) or the breed of a dog (e.g., collie, shepherd, terrier) would be
examples of categorical variables.
explanatory variable - answerhelps explain the response variable
response variable - answerresponds to the explanatory variable
Census - answer survey of a whole population. For example, the U.S. Census.
Censuses can be very expensive and time-consuming, if the population is large.
sample survey - answer takes a fraction of the population. Sample surveys are cheaper
than censuses, but are not as accurate. Bias can also be an issue
experiment - answer is a controlled study of a group. Experiments are very common in
the medical fields. The researcher controls how members are placed study groups and
which treatment each group receives. Bias can be a major issue with experiments.
observational study - answer is about the same as an experiment. However, the
researcher does not use control groups or assign treatments.
Statistics - answer science of collecting, describing, and analyzing data
cases or units - answersubjects/objects that we obtain information about
variable - answerany characteristic that is recorded for each case
quantitative variable - answermeasures or records a numerical quantity for each case
categorical variable - answerqualitative. values that are names or labels. The color of a
ball (e.g., red, green, blue) or the breed of a dog (e.g., collie, shepherd, terrier) would be
examples of categorical variables.
explanatory variable - answerhelps explain the response variable
response variable - answerresponds to the explanatory variable
