WGU D772: Statistical Data Literacy Exam
ACTUAL QUESTIONS AND CORRECT
ANSWERS
Population - CORRECT ANSWER an entire group of individuals or objects that you want to
study
Sample - CORRECT ANSWER a smaller, more manageable group selected from the
population to represent the larger group
Parameter - CORRECT ANSWER a numerical value describing an entire population's
characteristics
Statistic - CORRECT ANSWER a numerical value that describes a characteristic of a sample
Individuals - CORRECT ANSWER persons or objects described by a set of data
Variables - CORRECT ANSWER characteristics or measurements that we are interested in
studying
Quantitative variables - CORRECT ANSWER numerical measurements, such as age, height,
weight, or income
Categorical variables - CORRECT ANSWER categories or labels, such as hair color,
occupation, or favorite type of food
Data - CORRECT ANSWER actual values of the variables (raw information) that we collect
and analyze to gain insights into the phenomenon we are studying
Random sampling - CORRECT ANSWER process that allows researchers to choose a random
set of individuals from a population
, Simple random sample - CORRECT ANSWER sample chosen from a population from which
each possible subset of the same size has an equal probability of being chosen
Stratified sampling - CORRECT ANSWER method of random sampling that involves dividing
the population into distinct subgroups called strata, based on specific characteristics such as age,
gender, or socioeconomic status
Cluster sampling - CORRECT ANSWER method of random sampling that involves dividing
the population into clusters, which are naturally occurring groups like schools, neighborhoods, or
cities
Systematic sampling - CORRECT ANSWER method of random sampling that involves
selecting every nth individual from a list of the population, starting from a randomly chosen point
Explanatory variable - CORRECT ANSWER variable that a researcher manipulates or
observes changes in to explain or predict the results
Response variable - CORRECT ANSWER variable that represents the outcome the researcher
is interested in explaining or predicting
Observational study - CORRECT ANSWER when researchers observe and record data on
variables as they naturally occur, without any intervention or manipulation
Sample survey - CORRECT ANSWER specific type of observational study where individuals
self-report the values of variables, often by providing their opinions or answering questions
Experiment - CORRECT ANSWER when researchers intentionally manipulate one or more
variables (the explanatory variables) to observe their effect on another variable (the response variable)
Treatments - CORRECT ANSWER different values of the explanatory variable
Experimental unit - CORRECT ANSWER a single object or individual being measured
ACTUAL QUESTIONS AND CORRECT
ANSWERS
Population - CORRECT ANSWER an entire group of individuals or objects that you want to
study
Sample - CORRECT ANSWER a smaller, more manageable group selected from the
population to represent the larger group
Parameter - CORRECT ANSWER a numerical value describing an entire population's
characteristics
Statistic - CORRECT ANSWER a numerical value that describes a characteristic of a sample
Individuals - CORRECT ANSWER persons or objects described by a set of data
Variables - CORRECT ANSWER characteristics or measurements that we are interested in
studying
Quantitative variables - CORRECT ANSWER numerical measurements, such as age, height,
weight, or income
Categorical variables - CORRECT ANSWER categories or labels, such as hair color,
occupation, or favorite type of food
Data - CORRECT ANSWER actual values of the variables (raw information) that we collect
and analyze to gain insights into the phenomenon we are studying
Random sampling - CORRECT ANSWER process that allows researchers to choose a random
set of individuals from a population
, Simple random sample - CORRECT ANSWER sample chosen from a population from which
each possible subset of the same size has an equal probability of being chosen
Stratified sampling - CORRECT ANSWER method of random sampling that involves dividing
the population into distinct subgroups called strata, based on specific characteristics such as age,
gender, or socioeconomic status
Cluster sampling - CORRECT ANSWER method of random sampling that involves dividing
the population into clusters, which are naturally occurring groups like schools, neighborhoods, or
cities
Systematic sampling - CORRECT ANSWER method of random sampling that involves
selecting every nth individual from a list of the population, starting from a randomly chosen point
Explanatory variable - CORRECT ANSWER variable that a researcher manipulates or
observes changes in to explain or predict the results
Response variable - CORRECT ANSWER variable that represents the outcome the researcher
is interested in explaining or predicting
Observational study - CORRECT ANSWER when researchers observe and record data on
variables as they naturally occur, without any intervention or manipulation
Sample survey - CORRECT ANSWER specific type of observational study where individuals
self-report the values of variables, often by providing their opinions or answering questions
Experiment - CORRECT ANSWER when researchers intentionally manipulate one or more
variables (the explanatory variables) to observe their effect on another variable (the response variable)
Treatments - CORRECT ANSWER different values of the explanatory variable
Experimental unit - CORRECT ANSWER a single object or individual being measured
