Quick Quiz 7
A correlation of -0.60 indicates that ______ of the variation in Y is explained by X
36%
If we discover that a certain area has a low per capita income and a high rate of drug and alcohol-related arrests, it is possible that
Any or not of the above may be true
If we assign every left-handed participant a 0 on handedness variable, and every right-handed participant a "1", we are using _____ coding
Dummy variable
An investigator hypothesizes that people who belong to religious organizations tend of be involved in community activities as well. His unit of analysis should be
Individuals
The stem and leaf diagram
Is used to examine the shape of distribution Presents the raw data on which distribution is based Reveals the outliers in the distribution
The median is sometimes used as an index of central tendency because
It is more robust than the mean with regard to the influence of outliers
Data management refers to
Keeping and storing the data for future use Transforming the data and related information into a form that makes analysis possible
To analyze a continuous variable as if it were a dichotomous variable, _____ is used
Median split
The question of whether or not one variable causes another
Must be determined through statistical analysis Requires random assignment to levels of the IV Must be answered by considering the research design
An arbitrarily defined coding system is used whenever a variable is measured on a ______ scale
Nominal
A type I error is committed if the researcher
Rejects the null hypothesis when it is true
Which if the following contains instructions used to clarify observations into numerical values
The code book
In developing a coding scheme for a variable, it is important that
The coded categories for responses are mutually inclusive Categories for missing data are included
The choice of unit analysis in a particular study depends on
The research question The level to which the researcher wishes to generalize
A researcher that is interested in whether towns in a state voted Democrat or republican in the last election. Her unit of analysis should be
Towns
