1. Which of the following is true about the initial step in conducting a randomized blinded trial? Both subjects and res

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1. Which of the following is true about the initial
step in conducting a randomized blinded trial?
Both subjects and researchers are blinded to avoid
post-randomization confounding variables which may affect the
study’s validity.
Characteristics that prohibit subjects should be
specified including those who might have complications to the
planned intervention.
The number generating system is the most common method
used in ensuring equal probabilities of selection of
subjects.
The subjects are followed over time ensuring that they
follow the study protocol and that intervention variables are
measured.
2. Which of the following is true about
experimental studies?
They are conducted utilizing secondary data in a
retrospective manner.
They manipulate predictor variables to arrive at a
planned outcome.
They closely examine the relationship between
confounding variables.
They involve a cohort of subjects requiring follow-up
and monitoring.
3. When ensuring compliance in a randomized blinded
trial, which of the following element is included?
Randomization
Statistical analysis
Intervention
Attrition
4. Which of the following is the correct sequence
of steps in a randomized blinded trial?
Sample selection, describing study subjects, blinding,
monitoring adherence, comparing events
Blinding, describing study subjects, sample selection,
monitoring adherence, comparing events
Sample selection, describing study subjects, comparing
events, blinding, monitoring adherence
Describing study subjects, sample selection, comparing
events, blinding, monitoring adherence
5. Which of the following concepts is
correct?
Randomization – a process done to allow equal
distribution of probability that both groups will have the same
attrition rate
Inclusion criteria – a set of qualities that subjects
are screened for before they qualifying to be included in the
treatment group
Continuous outcomes – a kind of outcome variable
measured in which there is a 1:1 ratio of exposure and
disease
Effectiveness – like efficacy it reflects the measure of
effect a factor produces but outside of controlled or ideal
conditions
6. It occurs when cases are lost from a sample over
time or over a series of the sequential processes.
Testing Effect
Attrition Effect
Maturation Effect
Loss of complexity
7. An unethical experimenter wants to test the
relationship between discomfort and aggression. On a hot day, she
turns off the air conditioning in one dorm and leaves it on in
another, then has her research assistants count occurrences of
verbal aggression in common areas of the buildings. Students in the
air-conditioned dorm would be the ___ and the students in the
overheated dorm would be the ___.
study population, sampling
frame
experimental group, control group
independent sample, dependent sample
control group, experimental group