Will a laboratory decoy effect survive an actual online grocery basket? This GB794 external validity memo, written for Unit 7, weighs units, treatments, outcomes and settings to answer. Searches like "gb 794 unit 7 assignment example", "gb794 unit 7 sample" and "gb794 unit 7 example" land here.
What a finished GB794 Unit 7 external validity memo looks like
Four pages to the grocer's e-commerce director, plus a one-page evidence table. It opens on the proposal: list a 26-ounce bag at 24.49 beside the existing 12-ounce bag at 11.99 and 32-ounce bag at 24.99, expecting more shoppers to take the largest. Section two states the laboratory finding carefully, that adding an alternative dominated by one option but not the other raised the dominating option's share in hypothetical choices. Section three works through four dimensions drawn from Shadish, Cook and Campbell: who chose, what they saw, what counted as the outcome and where. The evidence table lists later tests, including Frederick, Lee and Baskin's 2014 finding that the effect weakened or vanished with realistic stimuli. A closing section predicts direction and rough size, and recommends a test in place of a launch.
How a GB794 Unit 7 example is structured
Each section narrows the distance between the original study and the proposed use. Stating the proposal in prices first keeps the memo concrete; an abstract discussion of generalizability would let a reader forget that real shoppers pay real money. The finding is then restated without inflation, so the memo cannot be accused of attacking a claim the authors never made. The four dimensions carry most of the argument. Units differ because repeat coffee buyers often reorder a habitual size without comparing. Treatments differ because the online page shows unit prices, which may make dominance glaringly obvious or make every option look calculated. Outcomes differ because hypothetical selections cost nothing. Settings differ because one choice sits inside a forty-item basket. A prediction with a direction and a range closes the memo, since declining to predict would leave the director nothing to decide.
The proposal, priced
Three bag sizes, one of them added purely for comparison. Listing the exact prices exposes the decoy's logic and lets the director see that the case rests on one behavioral finding, with no sales history at the grocer behind it.
The finding without inflation
Huber, Payne and Puto reported that a dominated option raised the dominating option's share among hypothetical choices. The memo keeps to that claim and sets aside the popular version, that decoys reliably steer buyers, which the original evidence never tested.
Four distances from the laboratory
Who chose, what they saw, what was measured and where each choice sat. Shadish, Cook and Campbell's framing organizes the gaps, and the memo gives each dimension its own evidence; no single paragraph of general caution stands in for all four.
What later tests found
Frederick, Lee and Baskin, and separately Yang and Lynn, report the effect weakening or disappearing when options appear as realistic products instead of numeric tables. The memo reads those results as narrowing conditions, the lesson the Unit 6 seminar drew about conditional effects.
A prediction with a range
Smaller than the laboratory effect, possibly zero, conceivably negative among habitual buyers. Committing to that range gives the director a decision criterion and hands the next unit a hypothesis a field test could actually refute.
Where marks go in GB794 Unit 7
Memos reciting threats to external validity from a textbook, with no link to coffee bags or grocery shoppers, earn little, because the prompt concerns one finding and one setting. The restatement of the laboratory result is read closely: inflating it to decoys work, then attacking the inflation, draws comment. GB794 readers expect each dimension of distance to carry its own reasoning, and memos treating students versus shoppers as the only gap miss the unit-price and basket questions. Later evidence cited as refutation instead of as narrowing overclaims in the opposite direction. Refusing to predict anything leaves the reader without a decision and usually costs credit. Recommending a launch on laboratory evidence alone, or a blanket rejection, both skip the proportionate answer: a test sized to detect a realistic effect.
Get a GB794 Unit 7 example written to your instructions
Which laboratory finding is your organization, or your prompt, trying to apply, and in what setting? Pair the answer with the Unit 7 instructions and rubric. The memo you receive restates the result precisely, measures its distance from the real setting along separate dimensions and commits to a prediction. Delivery is typically 24-48h, and the first sample is free.
GB794 Unit 7 questions, answered
Is external validity only about the sample?
No. The sample is one dimension; the treatment as delivered, the outcome measured and the setting each matter as much. A decoy effect found with students choosing among numbers can fail with real shoppers, but it can also fail with the same students once the options become pictures with prices. A memo covering all four dimensions shows the fuller reasoning.
Should the memo conclude that the laboratory finding is useless?
Rarely. Laboratory work establishes that a mechanism can operate, which is valuable, and the memo's task is judging how far that transfers. The usual conclusion is conditional: the effect is plausible but likely smaller in this setting, so a test is warranted before any rollout. Dismissing the finding entirely overclaims as much as adopting it would.
How many later studies should the memo cite?
Enough to show the direction of the evidence, often three to five. Here the original and two later projects carry the argument. Citing a dozen studies in a four-page memo crowds out analysis of the specific setting, and GB794 instructors generally reward depth on a few sources over coverage of many.