(a)
An observational study
measures the value of the response variable without attempting to influence the value of either the response or explanatory variables.
What kind of study Studies individuals and measures variables of interest but does not attempt to influence the responses?
An observational study
observes individuals and measures variables of interest but does not attempt to influence the responses. An experiment deliberately imposes some treatment on individuals to measure their responses.
What is the superior observational study?
Case-control studies
are always the superior observational study because they are relatively inexpensive to conduct and can be done relatively quickly.
What is observational and experimental study?
a observational study is
where nothing changes and just record what you see
, but an experimental study is where you have a control group and a testable group.
Is the response variable qualitative or quantitative?
The response variable is the number of individuals who participate in the study. The response variable is
quantitative
.
What type of observational study is this?
The two most common types of observational studies are
cohort studies and case-control studies
; a third type is cross-sectional studies. Cohort study. A cohort study is similar in concept to the experimental study.
What are the two response variables?
One response variable is the amount of time visiting the site. This response variable is quantitative. One response variable is the
amount spent by the visitor
. This response variable is quantitative.
What are the three types of observational study?
Three types of observational studies include
cohort studies, case-control studies, and cross-sectional studies
(Figure 1).
What are the 4 types of observation?
- Controlled Observations.
- Naturalistic Observations.
- Participant Observations.
What are the 4 principles of experimental design?
The basic principles of experimental design are
(i) Randomization, (ii) Replication and (iii) Local Control
.
What are the two types of quantitative variables?
There are two types of quantitative variables:
discrete and continuous
. What does the data represent? Counts of individual items or values. Measurements of continuous or non-finite values.
What are the two types of qualitative variables?
Qualitative variables are divided into two types:
nominal and ordinal
.
Is rank qualitative or quantitative?
Rank order data (also known as ordinal data) is a type of
quantitative data
.
What are the 3 major types of epidemiologic studies?
Three major types of epidemiologic studies are
cohort, case-control, and cross-sectional studies
(study designs are discussed in more detail in IOM, 2000). A cohort, or longitudinal, study follows a defined group over time.
What are the 5 types of observational studies?
Observational studies are usually categorized into various categories such as
case report or case series, ecologic, cross-sectional (prevalence study), case-control and cohort studies
. Other variants of these observational studies are also possible such as nested case-control study, case cohort study etc.
What are examples of observational studies?
Consider someone on the busy street of a New York neighborhood asking random people that pass by how many pets they have
, then taking this data and using it to decide if there should be more pet food stores in that area.
