Stats exam 1 review

What is a correlational design?

• design in which researchers study a group over a long period of time

• design in which researchers are interested in how specific variables relate to one another

• design in which researchers are interested in if one variable causes another

• a research design

what is a positive correlation

• as one variable increases so does the other as one variable decreases so does the other

• it means there is a strong relationship

• the correlation is good

• as one variable increases the other decreases

what is a negative correlation

• there is no relationship

• as one variable increases the other decreases

• as one variable decreases the other decreases

• there is a bad correlation

what is directionality

• when someone doesn’t know the difference between north and south

• inability to be certain if there is a relationship

• when there is a variable unaccounted for

• inability to be certain which variable comes first (which variable causes the other)

what is the 3rd variable problem

• when there is a variable unaccounted for by the researcher

• when the researcher doesn’t know if the relationship is positive or negative

• when the researcher doesn’t know which variable changes the other

• when there’s more than one variable being studied

what is a quasi-experimental design

• a design that resembles a true experiment design but uses naturally occurring groups/categories

• a design in which researchers are interested in how variables relate to one another

• a design that utilizes random selection and random assignment

• a design in which researchers are interested in variables

can a quasi-experimental design infer causation

• yes

• no

• sometimes, but most of the time

• sometimes, but not usually

which of the following is a nominal variable

• gender

• height

• weight

• time

what is an ordinal variable

• a variable in which the key value is the order or rank

• a qualitative variable

• a variable with no zero point

• an actual real-world variable that can be measured and have an absolute zero point

which of the following is an interval variable

• rate your happiness on a scale of 1-10

• percentages

• time

• eye color