Study Design Types: Compare and Contrast Examples Approaches

In 2014, the Centers for Disearse reported the percentage of people 18 years of age and older who smoke. Suppose that a study designed to collect new data on smokers and nonsmokers uses a preliminary estimate of the proportion who smoke of 0.30.
a) How large a sample should be taken to estimate the proportion of smokers in the population with a margin of error of 0.02? Use 95% confidence.(Round your answer up to the nearest integer.)
b)Assume that the study uses your sample size recommendation in part (a) and finds 470 smokers. What is the point estimate of the proportion of smokers in the population? (Round your answer to four decimal places.)
c) What is the 95% confidence interval for the proportion of smokers in the population? (Round your answer to four decimal places.)

glasskerfu 2020-11-16

The most appropriate study design depends, among other things, on the distribution of
1.A) The risk factor in the population of interest
2.B) The participants
3.C) The outcome in the population of interest
4.D) $A & C$

pedzenekO 2020-11-12

What is the ideal study design from a statistical point of view?
-Clinical trial
-Observational studies
-A&B
-None of the above

glamrockqueen7 2020-11-09

What is the difference between a between-subjects design and a within-subject design? Which t-test is used for each design? Provide a real- life example of a between-subjects design and a within-subjects design.

zi2lalZ 2020-11-08

To state:A factor that could affect the value of the response variable that is fixed at a set level.

Dolly Robinson 2020-11-08

A researcher is conducting a study to examine the effects of cognitive behavior therapy for the treatment of social anxiety in a sample of 16 participants. He measures the social anxiety scores of participants before the tratment and then again after treatment and the resulting data is as follows:
$n = 16, M_{0} = 5, s = 4$
a) What type of design is this study (single-sample, independent measures, repeated measures)
b)State the null and alternate hypotheses
c) Using an $α l e v e l o f .05 (α = .05)$ , identify the critical values of t for a 2-tailed test.

Cabiolab 2020-11-05

Do Left-Handers Die Earlier? According to a study published in the Journal of the American Public Health Association, lefthanded people do not die at an earlier age than right-handed people, contrary to the conclusion of a highly publicized report done 2 years earlier. The investigation involved a 6-year study of 3800 people in East Boston older than age 65. Researchers at Harvard University and the National Institute of Aging found that the “lefties” and “righties” died at exactly the same rate. “There was no difference, period,” said Dr. J. Guralnik, an epidemiologist at the institute and one of the coauthors of the report.

Nannie Mack 2020-11-05

Regarding observational studies and designed experiments:
a. Describe each type of statistical study.
b. With respect to possible conclusions, what important difference exists between these two types of statistical studies?

nitraiddQ 2020-11-01

An investigator wants to test whether exposure to secondhand smoke before 1 year of life is associated with development of childhood asthma (defined as asthma diagnosed before 5 years of age). Give two possible study designs.

Tolnaio 2020-11-01

1.An investigator wants to assess whether the use of a specific medication given to infants born prematurely is associated with developmental delay. Infants who were born prematurely are recruited and followed for 2-years.
Some of the infants were given the medication at birth and others were not. All infants will undergo extensive testing at age 2 to assess various aspects of development.
What type of study design: The Case Report/Case Series, The Cross-Sectional Survey, The Cohort Study, The Case Control Study, The Nested Case-Control Study, The Randomized Controlled Trial or The Crossover Trial?

pedzenekO 2020-10-31

Describe the Process design phase?

foass77W 2020-10-28

Which of the following claims about cohort and case-control studies is true, and which ones are false?
(I) Case-control studies are controlled experiments, whilst cohort studies are observational studies.
(II) Case-control studies are better for rare diseases, compared to cohort studies.

ruigE 2020-10-27

Identify the type of random sampling used in the study design.
The researcher is interested compare the student's loan debt for the students who attend four-year public universities and four-year private universities. A random sample of 100 graduates of the public universities and 100 graduates of private universities are taken.

Kyran Hudson 2020-10-27

To find:The conditions for the population and the study design that are required by the procedure and are used to contruct the confidence interval.
To identify:The important conditions for the validity of the procedure in the given case.
In an experiment on the effect of calcium and blood pressure, 54 healthy white males are divided into two groups’ calcium and placebo. The summary statistic for the systolic blood pressure of the 27 members of the placebo group is ¥ = 114.9 and s=9.3.

Tammy Todd 2020-10-20

The explanatory variable in the given study.
To determine:Whether the given explanatory variable is qualtitative or quantitative.

When you are dealing with statistics and probability as a college student or need to solve some questions for your school class, the study design is an interesting concept to consider. The most important is to design and structure your statistical data. Start with the study design questions that must be answered by taking notes and explaining why you have taken a specific methodology. It will help you to narrow things down and avoid serving several statistical methods that can either make things simpler or even more complex. The study design example that you choose should serve as the template only as you should keep things unique! For example, when you need finding Y intercept

High school statistics

Quantitative and Qualitative Study Design Examples