PSYC 207 TWU Summer Exam
Questions and Answers
Why are statistics relevant? - Answer-Helps one to critically evaluate the literature
Statistics work best when they are used to - Answer-Disprove things
Bias - Answer-Oversampling of people that have a similar characteristic
Population - Answer-A well defined group of people or objects that share a common
characteristic
Sample - Answer-A relatively small proportion of people who are chosen in a survey so
as to be representative of the whole.
Sampling bias - Answer-Occurs when the individuals selected for a sample over or
under represent population attributes related to the study
What can statistics do? - Answer-Describe, organize, interpret, and make conclusions
make inferences
Descriptive statistics - Answer-Allow us to simplify and organize large amount of data
Inferential Statistics - Answer-Inferences made from samples about the whole
population of interest as a whole, based on the measurements taken only on this one
sample.
Central Tendency Scores - Answer-- a single score that best represents all the scores
(mean, median, mode)
Mean - Answer-Average
Xbar =SigmaX/n
N - Answer-population
n - Answer-sample
Outliers - Answer-extreme values that are separate from the rest of the data. Can skew
or distort findings.
Measurement Errors - Answer-Instrument error, instructions not followed correctly.
Questions and Answers
Why are statistics relevant? - Answer-Helps one to critically evaluate the literature
Statistics work best when they are used to - Answer-Disprove things
Bias - Answer-Oversampling of people that have a similar characteristic
Population - Answer-A well defined group of people or objects that share a common
characteristic
Sample - Answer-A relatively small proportion of people who are chosen in a survey so
as to be representative of the whole.
Sampling bias - Answer-Occurs when the individuals selected for a sample over or
under represent population attributes related to the study
What can statistics do? - Answer-Describe, organize, interpret, and make conclusions
make inferences
Descriptive statistics - Answer-Allow us to simplify and organize large amount of data
Inferential Statistics - Answer-Inferences made from samples about the whole
population of interest as a whole, based on the measurements taken only on this one
sample.
Central Tendency Scores - Answer-- a single score that best represents all the scores
(mean, median, mode)
Mean - Answer-Average
Xbar =SigmaX/n
N - Answer-population
n - Answer-sample
Outliers - Answer-extreme values that are separate from the rest of the data. Can skew
or distort findings.
Measurement Errors - Answer-Instrument error, instructions not followed correctly.
