#1
Which of the following is a fundamental principle of measurement?
Accuracy
ExplanationPrecision is the closeness of measurements to each other, accuracy is the closeness to the true value
#2
What is the purpose of blinding in an experiment?
To prevent bias in the results
ExplanationPreventing bias in results
#3
What is the difference between internal and external validity in experimental design?
Internal validity refers to the consistency within the experiment, external validity refers to the generalizability of results
ExplanationDifference between consistency and generalizability
#4
What is the purpose of a cross-sectional study in research?
To collect data from a single point in time for a specific group
ExplanationCollecting data at a single point for a specific group
#5
In experimental research, what is a crossover design?
A design where participants serve as their own controls in different conditions
ExplanationParticipants serving as their own controls
#6
What does the term 'reliability' refer to in the context of experimental design?
Consistency and stability of measurement
ExplanationConsistency and stability of measurement
#7
In a controlled experiment, what is the purpose of a control group?
To serve as a baseline for comparison
ExplanationTo serve as a baseline for comparison
#8
What is the significance of a p-value in statistical analysis?
It assesses the strength of evidence against a null hypothesis
ExplanationAssessing evidence against null hypothesis
#9
In experimental design, what does the term 'randomization' mean?
Random assignment of participants to groups
ExplanationRandom assignment to groups
#10
What is the purpose of a placebo in a controlled experiment?
To prevent bias in the results
ExplanationPreventing bias in results
#11
What is a confounding variable in experimental design?
A variable that interferes with the interpretation of results
ExplanationVariable interfering with result interpretation
#12
What is the difference between a dependent variable and an independent variable in an experiment?
Dependent variable is the outcome, independent variable is manipulated
ExplanationDifference between outcome and manipulated variables
#13
What is a Type I error in hypothesis testing?
Rejecting a true null hypothesis
ExplanationRejecting a true null hypothesis
#14
What is the purpose of a double-blind study in experimental design?
To prevent bias in the results by keeping both participants and researchers unaware of group assignments
ExplanationPreventing bias by keeping participants and researchers unaware
#15
What is the difference between descriptive and inferential statistics?
Descriptive statistics summarize data, inferential statistics make predictions about populations based on samples
ExplanationDifference between summarizing data and making predictions
#16
What is the difference between precision and accuracy in measurement?
Precision is the closeness of measurements to each other, accuracy is the closeness to the true value
ExplanationPrecision vs. accuracy distinction
#17
What is a factorial design in experimental design?
An experimental design involving multiple independent variables
ExplanationDesign with multiple independent variables
#18
What is the purpose of a pilot study in the context of experimental design?
To refine the experimental procedures and identify potential issues
ExplanationRefining procedures and identifying issues
#19
In the context of measurement, what does the term 'validity' refer to?
The extent to which a measurement assesses what it intends to measure
ExplanationExtent of measurement's intended assessment
#20
In statistical analysis, what is the purpose of regression analysis?
To explore relationships between variables and make predictions
ExplanationExploring relationships and making predictions
#21
What is the role of a mediator variable in causal relationships?
To explain the process through which the independent variable affects the dependent variable
ExplanationExplaining process of independent variable's effect on dependent variable
#22
What is the purpose of a within-subjects design in experimental research?
To manipulate variables within the same group of participants
ExplanationManipulating variables within the same group
#23
What does the term 'statistical power' refer to in experimental design?
The probability of rejecting a false null hypothesis
ExplanationProbability of rejecting a false null hypothesis
#24
What is the purpose of a stratified random sampling in research?
To ensure representation of different subgroups in the sample
ExplanationEnsuring representation of different subgroups
#25
What is the role of a factorial ANOVA in statistical analysis?
To assess the interaction effects of multiple independent variables on a dependent variable
ExplanationAssessing interaction effects of multiple independent variables