The standard error of sample mean 
is large when the observations in the population are spread out (large 
), but that the standard error can be reduced by taking a smaller sample.
Definitions:
Statistically Significant
A measure indicating that the likelihood of a particular result occurring by chance is low, and thus, the result can be considered to have genuine association.
Correlational Study
A research method that examines the relationship between variables, without implying a cause-and-effect relationship.
Experiment
A scientific procedure undertaken to test a hypothesis by systematically manipulating variables.
Experimental Study
A study involving manipulation of variables to determine cause and effect relationships.
Q13: Which of the following is not a
Q23: Statistical inference is the science of using
Q25: Find the probability that the number of
Q35: From a sample of 500 items, 30
Q39: A histogram that tails out toward larger
Q64: (A) Construct a 90% confidence interval estimate
Q64: The number of weekly sales calls by
Q81: The test statistic in a hypothesis test
Q83: The four areas of a pivot table
Q85: One reason for standardizing random variables is