OPRE 6301 TEsT 1 Exam QuEsTiOns and answERs PRacTicE
QuEsTiOns wiTh sOluTiOns nEwEsT 2026 2027 | alREady
GRadEd a+
Stratified Random Sample - ANSWER-obtained by separating the population into
mutually exclusive sets, or strata, and then drawing simple random samples from each
stratum. Ex. Having 4 different types of a product and need to find out satisfaction levels
of each different type. Separate into those groups and pick randomly from each
Statistical Inference - ANSWER-The process of making an estimate, prediction or
decision about a population based on sample data. Saying that 20% of all students are
business majors based on a sample statistic
Discrete Variable - ANSWER-A variable that has a finite number of possibilities
Direct Observation - ANSWER-Collecting data by observing the behavior. Ex. A
researcher wants to see peoples eating habits so he watches in the cafeteria while
people eat
Simple Random Sample - ANSWER-a sample selected in such a way that every possible
sample with the same number of observations is equally likely to be chosen. Ex. drawing
a name out of a hat
Nonsampling Error - ANSWER-Mistakes made in the acquisition of data or from the
sample observations being selected improperly. Ex. errors in data acquisition, non
response errors, selection bias
Errors in data acquisition - ANSWER-This type of error arises from the recording of
incorrect responses
Nonresponse Error - ANSWER-Refers to error introduced when responses are not
obtained from some members of the sample. Ex. interviewer may be unable to contact
person, or person may refuse
QuEsTiOns wiTh sOluTiOns nEwEsT 2026 2027 | alREady
GRadEd a+
Stratified Random Sample - ANSWER-obtained by separating the population into
mutually exclusive sets, or strata, and then drawing simple random samples from each
stratum. Ex. Having 4 different types of a product and need to find out satisfaction levels
of each different type. Separate into those groups and pick randomly from each
Statistical Inference - ANSWER-The process of making an estimate, prediction or
decision about a population based on sample data. Saying that 20% of all students are
business majors based on a sample statistic
Discrete Variable - ANSWER-A variable that has a finite number of possibilities
Direct Observation - ANSWER-Collecting data by observing the behavior. Ex. A
researcher wants to see peoples eating habits so he watches in the cafeteria while
people eat
Simple Random Sample - ANSWER-a sample selected in such a way that every possible
sample with the same number of observations is equally likely to be chosen. Ex. drawing
a name out of a hat
Nonsampling Error - ANSWER-Mistakes made in the acquisition of data or from the
sample observations being selected improperly. Ex. errors in data acquisition, non
response errors, selection bias
Errors in data acquisition - ANSWER-This type of error arises from the recording of
incorrect responses
Nonresponse Error - ANSWER-Refers to error introduced when responses are not
obtained from some members of the sample. Ex. interviewer may be unable to contact
person, or person may refuse
