STA 210 EXAM 1 QUESTIONS
WITH ACCURATE ANSWERS
Causation correct answer indicates that one event is the result of the occurrence
of the other event; i.e. there is a causal relationship between the two events. This
is also referred to as cause and effect.
Confounding correct answer An extraneous variable in a statistical model that
correlates (directly or inversely) with both the dependent variable and the
independent variable.
Correlation Coefficient (r) correct answer -A numerical way of summarizing the
association between two variables, provided those two can be represented in a
scatter plot.
Correlation correct answer -Tendency for certain values of one variable to be
paired with certain other variables of another variable.
-For two variables to be correlated, the must have some sort of association
between them, (For every x value there is a y value).
Correlation does not imply correct answer Causation
Decimal Dilemmas correct answer Decimal mistakes that cause major deception.
Decimal dilemmas are one of the biggest sources for incorrect human inference.
Explain the difference between Correlation and Causation. correct answer
Correlation is a straight line association between two things, it is visual.
Causation is when one thing causes the other.
, Explanatory Variable: correct answer A variable we might think cause changes in
the response variable
How do you calculate Variance? correct answer Step #1: calculate the mean of the
data set.
Step #2: Then for each number in the data set: subtract the Mean and square the
result (the squared difference).
Step #3: Then calculate the average of those squared differences.
How do you compute the Standard Deviation? correct answer Take square root of
the Variance.
How many Americans die each year? correct answer 2.4 Million
How many americans identify as latino? correct answer 16%
How many babies are born in the US each year? correct answer About 4 million
How many black Americans are there? correct answer About 40 Milliom
How many people die from AIDs each year? correct answer about 16,000
How many people die from cancer each year? correct answer 1 in 4
WITH ACCURATE ANSWERS
Causation correct answer indicates that one event is the result of the occurrence
of the other event; i.e. there is a causal relationship between the two events. This
is also referred to as cause and effect.
Confounding correct answer An extraneous variable in a statistical model that
correlates (directly or inversely) with both the dependent variable and the
independent variable.
Correlation Coefficient (r) correct answer -A numerical way of summarizing the
association between two variables, provided those two can be represented in a
scatter plot.
Correlation correct answer -Tendency for certain values of one variable to be
paired with certain other variables of another variable.
-For two variables to be correlated, the must have some sort of association
between them, (For every x value there is a y value).
Correlation does not imply correct answer Causation
Decimal Dilemmas correct answer Decimal mistakes that cause major deception.
Decimal dilemmas are one of the biggest sources for incorrect human inference.
Explain the difference between Correlation and Causation. correct answer
Correlation is a straight line association between two things, it is visual.
Causation is when one thing causes the other.
, Explanatory Variable: correct answer A variable we might think cause changes in
the response variable
How do you calculate Variance? correct answer Step #1: calculate the mean of the
data set.
Step #2: Then for each number in the data set: subtract the Mean and square the
result (the squared difference).
Step #3: Then calculate the average of those squared differences.
How do you compute the Standard Deviation? correct answer Take square root of
the Variance.
How many Americans die each year? correct answer 2.4 Million
How many americans identify as latino? correct answer 16%
How many babies are born in the US each year? correct answer About 4 million
How many black Americans are there? correct answer About 40 Milliom
How many people die from AIDs each year? correct answer about 16,000
How many people die from cancer each year? correct answer 1 in 4
