STA 261 Module 1 Part 1
Simulation and Intro to
Statistics Questions and
Complete Solutions
Graded A+
when performing an experiment is not practical, economically or ethically or time-wise - Answer: when
is a simulation used
significant - Answer: if an event is unlikely to occur, it is statistically ______
total set of all individuals of interest - Answer: population
a subset of total individuals selected from a population - Answer: sample
numerical characteristics of a population, a fixed quantity - Answer: parameter
numerical characteristics of a sample, a variable quantity - Answer: statistics
populations - Answer: parameters describe
samples - Answer: statistics describe
census, sampling (surveying), experimentation - Answer: three ways to obtain information
, obtaining info from entire population of interest (expensive & difficult) - Answer: census
choosing a representative sample from the population of interest - Answer: sampling (surveying)
researchers impose treatments & controls on subjects (experimental units) from the population of
interest (not random, but randomly assigned to groups or treatments) - Answer: experimentation
sample because a census is expensive & hard to accomplish (sample is easier because not contacting
everyone) - Answer: is a sample or a census more practical?
-reducing data to simple summaries without losing or distorting data
-can be used with sample or population data - Answer: main purpose of descriptive stats
-methods for drawing & measuring the reliability of conclusions about a population
-can only be used with sample data since it makes predictions about a population
(example: polls to predict who will be elected president) - Answer: inferential statistics
examine and explore data for data's sake (example: baseball stats)
-can be used on a BOTH a population or a sample - Answer: descriptive study
-Mean, median, standard deviation, etc...
- Graphical displays - Answer: descriptive stats include
-confidence intervals
-hypothesis tests - Answer: inferential stats include
-also called probability sampling
-method that employs a random device to determine which members of the population will be selected
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