Beyond the overall ANOVA result, the Week 6 post hoc note names which pairs of groups differ, which cannot be separated, and why the chosen comparison procedure suits the variances. Searches like "ddba 8307b week 6 assignment example", "ddba8307b week 6 sample" and "ddba 8307b week 6 example" land here.
What a finished DDBA 8307B Week 6 post hoc note looks like
Two pages of prose built on four SPSS tables: Descriptives, the Test of Homogeneity of Variances, the ANOVA table and Multiple Comparisons. The note opens with the omnibus result in standard form, F with both degrees of freedom and eta squared, then says in a sentence that at least one shop differs. Because Levene's test indicates unequal variances, the note uses the Welch statistic from the robust tests table and Games-Howell comparisons rather than Tukey's HSD, and explains that choice in two sentences. The pairs follow in a small table of mean differences with intervals. One shop costs more per claim than two of the others; its difference from the fourth cannot be separated from zero. A paragraph drawing on Gelman and Stern warns that this pattern does not show the fourth shop resembles the cheaper two.
How a DDBA 8307B Week 6 example is structured
The note moves from the general to the specific and then back out to the decision. First comes the omnibus sentence, kept short, because its only job is to license looking at pairs. The procedure paragraph follows, stating which post hoc method was chosen and why, before any pair is mentioned, so the choice cannot appear to follow the results. Pairs are then reported in order of importance to the claims manager, beginning with the clearest difference. The interpretation paragraph guards against the two common misreadings: treating a nonsignificant pair as equal, and treating a chain of comparisons as transitive. A case-mix paragraph names what the comparison cannot address, since shops receiving more severe claims will cost more for reasons unrelated to efficiency. The note closes with one plain sentence per finding.
The omnibus result, briefly
F, degrees of freedom, p and eta squared in one sentence, then the plain meaning: somewhere among the four shops, average costs differ. The note does not dwell here, because the claims manager's question is about particular shops.
Why Games-Howell
Unequal variances rule out Tukey's HSD, which assumes them equal. Games-Howell handles unequal spread, and the note states the choice before reporting pairs. Six separate t-tests are rejected because they inflate the chance of a false difference.
Pairs that differ
One shop's average cost per claim exceeds two others, reported as mean differences with intervals and restated in dollars. These are the findings the claims team can act on first.
Pairs that cannot be separated
The costly shop and the fourth shop show no clear difference. The note says the data cannot tell them apart, a weaker statement than showing they cost the same.
Not a verdict on efficiency
Shops assigned heavier collision work will cost more per claim. Without severity data, the note says, the comparison locates differences and leaves their cause open.
Where marks go in DDBA 8307B Week 6
Graders look for pairs named precisely and read honestly. A note that reports a significant ANOVA and stops tells the claims manager only that the shops differ somewhere; the pairwise section, which says where, carries most of the credit. Procedure choice is marked closely, and selecting Tukey's HSD despite a significant Levene result, or giving no reason for the method, costs the analytic share. The interpretation paragraph is where upper-band notes separate themselves: reading a nonsignificant pair as evidence of equality, or reasoning that one shop resembles another through a third, are the errors this week targets. Graders also check the effect size, since F without eta squared says nothing about magnitude. A final share rewards the case-mix caution, and notes ranking shops by efficiency from average cost alone lose it.
Get a DDBA 8307B Week 6 example written to your instructions
Upload the Week 6 prompt and rubric and say how many groups your analysis compares, and on what measure. A post hoc note naming the differing pairs and defending its procedure comes back inside 24-48h, and the first one is free. Shops and costs in the sample are fictional; which pairs differ in your data is for your output to say.
DDBA 8307B Week 6 questions, answered
Should post hoc tests be run if the ANOVA is not significant?
Usually not, in a course following the conventional sequence, since the omnibus test is what licenses looking at pairs. Some methodologists argue that planned comparisons, specified before the data were seen, can be tested regardless, because they answer questions set in advance. If your prompt or proposal named particular comparisons beforehand, the note can say so and report them on those grounds.
How is the choice between Tukey and Games-Howell made?
Mainly by the variance check. Tukey's HSD assumes the groups have similar variances; Games-Howell does not rely on equal variances, which makes it the usual choice when Levene's test indicates unequal spread. The note states which condition held and picks accordingly. Choosing after seeing which method produces more significant pairs is the practice markers watch for and penalize.
What effect size belongs in the post hoc note?
Eta squared for the overall comparison, showing how much of the variation in cost is associated with shop, and mean differences with confidence intervals for each pair, since those are in the units the claims manager uses. Some sections also expect a standardized difference for key pairs. Whatever is reported, the plain sentence beneath it should translate the figure into dollars per claim.