HS305 Unit 6 Study Design Comparison Example

Course	HS305 Research Methods for Health Sciences
Unit	Unit 6
Paper type	Study design comparison
Length	About 870 words, 6 pages double-spaced
Format	APA 7 student paper
School	Purdue University Global
Program	BS in Health Science
Updated	October 2026

Free sample paper for HS305 Unit 6

Six Designs, One Desk: A Unit 6 Study Design Comparison of What Each Could Conclude About Sit-Stand Desks and Back Pain

[Student Name]

Purdue University Global

HS305: Research Methods for Health Sciences

Unit 6 Study Design Comparison

[Instructor Name]

[Date]

The studies described are hypothetical versions of each design applied to one topic; the methods literature and review cited are real.

What this part is doingHolding the topic constant in the lead tells the reader that differences in what can be concluded come from the designs, not the subject.

The Five Questions Asked of Each Design

How do participants come to be in each group? Which way does time run? What can the design establish about desks and back pain? What can it not establish? What question does it fit best? Asking the same questions of every design is what makes the comparison fair, since every design is strong for some questions and weak for others (Grimes & Schulz, 2002).

Randomized Controlled Trial

Groups: assigned by chance to a sit-stand desk or a standard desk. Time: forward, from assignment to pain measured at twelve weeks. Can establish: whether providing a sit-stand desk changes back pain, because chance balances the groups on everything else. Cannot establish: effects in people who would never accept a new desk, or effects beyond the follow-up period. Fits best: does assignment to a sit-stand desk reduce pain?

Cohort Study

Groups: self-selected; workers who chose a sit-stand desk compared with those who did not. Time: forward, from desk choice to later pain. Can establish: whether workers who chose one report less pain later, and how common pain is in each group. Cannot establish: that the desk caused any difference, because workers who choose one may already differ in fitness, job or pain history. Fits best: do workers who chose sit-stand desks report less pain a year later?

Case-Control Study

Groups: chosen by outcome; workers with chronic back pain compared with workers without. Time: backward, from outcome to past desk use. Can establish: whether past sit-stand desk use is more or less common among those with pain. Cannot establish: incidence, and it is vulnerable to recall, since people with pain may remember their desk habits differently (Schulz & Grimes, 2002). Fits best: is a history of sit-stand desk use less common among workers with chronic back pain? This design suits rare outcomes, which ordinary back pain is not, so it is the weakest fit here.

Cross-Sectional Survey

Groups: none assigned; desk type and pain measured at one moment. Time: a single point. Can establish: how many workers use sit-stand desks and how common pain is among them now. Cannot establish: which came first; workers with pain may have requested the desk. Fits best: how prevalent is back pain among sit-stand desk users at one company?

Interview Study

Groups: purposively chosen workers who use or have stopped using the standing function. Time: experiences recalled and described. Can establish: why people use or abandon the standing function, and how they experience pain at work. Cannot establish: how often anything happens or whether desks reduce pain. Fits best: why do workers stop using the standing function after a few weeks?

Systematic Review

Groups: none; studies are the unit. Time: whatever the included studies used. Can establish: what the body of evidence shows and how certain it is. A review of workplace interventions found sit-stand desks reduce sitting time, with limited evidence on longer-term health outcomes (Shrestha et al., 2018). Cannot establish: anything the included studies did not measure. Fits best: what does all the available evidence say about sit-stand desks and back pain?

Each design answers its own question well and the others' questions poorly, which is why the choice of design starts from the question, not from a ranking of designs.

What this part is doingStating the principle after the six rows lets the reader check it against every row above.

Why a Hierarchy Is Not Enough

Textbooks often rank designs in a pyramid, with systematic reviews and trials at the top and case series and opinion near the bottom. The ranking is useful for questions about cause, where chance assignment is the strongest protection against confounding. It misleads for other questions. A trial cannot tell a manager why workers stop standing after three weeks; an interview study can. A survey is the right tool for counting how many workers have pain now, and a trial would be a wasteful way to do it. The table above therefore treats the pyramid as an answer to one kind of question, not as a verdict on the designs.

What the Comparison Means for My Question

My Unit 4 question asks whether using a sit-stand desk reduces back pain compared with a standard desk. That is a question about cause, and only the trial can answer it directly. The cohort and survey could support or weaken the case but cannot settle it. The interview study answers a different, useful question about adherence, which matters because a trial is only as good as participants' actual use of the desk. The review tells me what is already known and where the gap is.

A Combined Approach

A practical plan would pair the trial with a brief interview component at twelve weeks, asking participants in the sit-stand group how often they stood and what made them stop. That would explain a null result if one occurred, since a desk that is not used cannot reduce pain.

What this part is doingProposing a combination shows the comparison has fed into a design decision, which is what the unit is preparing for.

References

Grimes, D. A., & Schulz, K. F. (2002). An overview of clinical research: The lay of the land. The Lancet, 359(9300), 57-61. https://doi.org/10.1016/S0140-6736(02)07283-5

Schulz, K. F., & Grimes, D. A. (2002). Case-control studies: Research in reverse. The Lancet, 359(9304), 431-434. https://doi.org/10.1016/S0140-6736(02)07605-5

Shrestha, N., Kukkonen-Harjula, K. T., Verbeek, J. H., Ijaz, S., Hermans, V., & Pedisic, Z. (2018). Workplace interventions for reducing sitting at work. Cochrane Database of Systematic Reviews, 2018(12), CD010912. https://doi.org/10.1002/14651858.CD010912.pub5

HS305 Unit 6 instructions, in plain terms

Unit 6 typically asks you to compare several study designs, either in general or applied to your own research question, and to explain which suits the question best. Expect a table or a set of parallel sections over two to four pages. Instructors look for each design described accurately, especially how participants come to be in each group and the direction of time, and for honest statements of what each design can and cannot show. Many sections ask you to connect the comparison back to your question and justify a choice. Some include qualitative designs and reviews; check whether yours does. Cite at least one methods source for the design definitions rather than relying on the course text alone.

Inside the HS305 Unit 6 example

The comparison opens by listing its five questions so the reader can check every row against them. Six parallel sections follow, randomized trial, cohort, case-control, cross-sectional survey, interview study and systematic review, each answering the same five prompts in the same order with the sit-stand desk as the running example. The review section cites a real Cochrane review on reducing sitting at work. The highlighted sentence states that each design answers its own question well and the others poorly. A section on hierarchy explains where the pyramid helps and where it misleads. The paper then applies the comparison to the Unit 4 question, concluding that only the trial tests cause, and ends by pairing the trial with short interviews about actual desk use.

Reading the HS305 Unit 6 grading rubric

Design comparisons usually draw marks for accuracy of each description, depth of the can and cannot analysis, application to the student's question, use of methods literature and organization. Accuracy and the analysis of limits typically outweigh the rest, since confusing a cohort with a case-control study, or claiming a survey can show what came first, costs points quickly. Application is rewarded when the choice of design follows clearly from the question rather than from a ranking. Methods sources earn credit when they support specific definitions. Organization is easier to score well on with parallel sections or a table, because the grader can compare designs line by line. A short justified recommendation at the end often lifts an otherwise descriptive paper.

HS305 Unit 6 help: mistakes that cost points

The commonest error is describing a cohort and a case-control study the same way; the difference is whether participants are selected by exposure or by outcome. Another is listing designs with textbook definitions and never applying them to a topic. Some students treat the evidence pyramid as a rule and dismiss qualitative work, even when the question is about experience or adherence. Others claim a cross-sectional survey shows that a desk reduced pain. Uneven sections, with a full page on trials and a sentence on reviews, suggest the comparison was not systematic. If your section names other designs, such as quasi-experiments or mixed methods, send the list and your question and we can help you compare them in parallel.

Get an HS305 Unit 6 example written to your instructions

Send the designs your Unit 6 prompt lists, the topic or question they should be matched to, and the rubric. The comparison ties each design to a question it can answer and a limit it cannot escape, then argues for one. A first custom sample is free and takes 24-48h. The paper above is an original model document written by our desk, not a submitted student paper and not an official Purdue University Global document.

More HS305 papers and BS in Health Science samples

HS305 Unit 6 questions, answered

Is a randomized trial always the right choice?

For questions about whether an intervention causes an outcome, it usually gives the strongest answer, but it is not always possible or ethical. Exposures that cannot be assigned, such as smoking, and outcomes that take decades call for observational designs. The sample's selection paragraph states the trade-off explicitly because many HS305 rubrics reward the reasoning more than the choice.

What is the quickest way to tell a cohort from a case-control study?

Ask how participants were selected. A cohort starts with people grouped by exposure and follows them to see who develops the outcome. A case-control study starts with people who have the outcome and a comparison group who do not, then looks back at exposure. The sample makes that selection column the first in the table for this reason.

Where do systematic reviews belong in a design comparison?

They are syntheses rather than primary designs, and some sections leave them out for that reason. Where they are included, the useful comparison is what they add: several trials judged together, with the combined result more stable than any single study. Their conclusions are only as sound as the studies they include, which the sample notes in its cannot column.

Where can I find a free HS305 Unit 6 sample paper?

The full Unit 6 study design comparison appears on this page, setting six designs against the sit-stand desk and back pain question.

Can an interview study be part of a design comparison?

Yes. It answers questions about experience and reasons, such as why workers stop using the standing function, which no trial or survey answers as well.