A
A bias that occurs when individuals self-select to participate.
Voluntary Response (B)
A special type of block design in which each unit does both treatments in random order.
Matched Pairs (E)
A non-randomized sampling method where data is collected from an easily accessible and available group of people.
Convenience sample (AA)
The specific information that we are interested in estimating during a data collection process.
Parameter of interest (G)
An unmeasured third variable that influences both the factor and the response variable.
Confounding variable (M)
Anything that causes data to be wrong.
Bias (H)
A bias that occurs when some members of the population are not represented.
Undercoverage (A)
Units are blocked into groups and then randomly assigned the treatment.
Randomized block
A part of the population that is examined to gather information.
Sample (W)
A sampling technique in which each member of a population has an equal chance of being selected.
Simple Random Sample (J)
The ability to duplicate and experiment to provide consistency in the experiment's results.
Replication (D)
A "dummy" treatment that can have no physical effect. A harmless pill, medication, or treatment prescribed for the psychological benefit of the experimental unit.
Placebo (U)
A method of sampling where the population is grouped into subpopulations called strata. Then a random sample is selected from each stratum.
Stratified Sample (BB)
The entire group of individuals that we want information about.
Population (Q)
A specific experimental condition assigned to the experimental units.
Treatment (V)
What you measure in an experiment.
Response variable (Y)
The use of chance to assign subjects to treatments.
Randomization (C)
A specific value for the factor.
Level (K)
A list of every individual in the population.
Sampling frame (P)
Actively impose some treatment in order to observe the response.
Experiment (S)
A group in an experiment that are shielded from exposure to variables, used to compare the factor against.
Control group (Z)
Neither the experimental units nor the evaluator knows which treatment they receive.
Double Blind (L)
A complete count of the population.
Census (O)
The single individual to which the different treatments are assigned.
Experimental units (T)
Method used so that experimental units do not know what treatment they are getting.
Blinding (F)
The explanatory variable.
Factor (X)
Observing outcomes without imposing any treatment.
Observational Study (R)
An element that remains unchanged or unaffected by other variables.
Control (I)
A set of data with a mean of 45 and a standard deviation of 8.3 is normally distributed. What is +1 standard deviation?
53.3
A set of data with a mean of 45 and a standard deviation of 8.3 is normally distributed. What is -1 standard deviation?
36.7
A set of data with a mean of 45 and a standard deviation of 8.3 is normally distributed. What is +2 standard deviation?
61.6
A set of data with a mean of 45 and a standard deviation of 8.3 is normally distributed. What is -2 standard deviation?
28.4
A set of data with a mean of 45 and a standard deviation of 8.3 is normally distributed. What is -3 standard deviation?
20.1
A set of data with a mean of 45 and a standard deviation of 8.3 is normally distributed. What is +3 standard deviation?
69.9
A set of data with a mean of 45 and a standard deviation of 8.3 is normally distributed. What is -4 standard deviation?
11.8
A set of data with a mean of 5.1 and a standard deviation of 0.9 is normally distributed. What is the percent of data within 6.0 and 6.9?
13.5%
A set of data with a mean of 5.1 and a standard deviation of 0.9 is normally distributed. What is the percent of data between 4.2 and 5.1?
34%
A set of data with a mean of 5.1 and a standard deviation of 0.9 is normally distributed. What is the percent of data less than 5.1?
50%
A set of data with a mean of 5.1 and a standard deviation of 0.9 is normally distributed. What is the percent of data less than 4.2?
16%
A set of data with a mean of 5.1 and a standard deviation of 0.9 is normally distributed. What is the percent of data greater than 6.9?
2.5%
A set of data with a mean of 5.1 and a standard deviation of 0.9 is normally distributed. What is the percent of data between 4.2 and 6.0?
68%
A set of data with a mean of 5.1 and a standard deviation of 0.9 is normally distributed. What is the percent of data between 2.4 and 4.2?
15.85%