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Biostatistics Final Exam Definitions UTA well answered to pass
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Biostatistics Final Exam Definitions UTAwell answered to pass
Bonferroni-Holm Multiple Comparisons - correct answer ✔✔-In the context of an ANOVA, rejecting the
null hypothesis means there is a statistical difference between at least two means, but it won't tell you
where it is. You use this to discover exactly which means are different.
-Only used for Model I ANOVAs
-A t-statistic for a two sample t-test assuming equal variance
Steps to Applying the Bonferroni-Holm Multiple Comparison Test - correct answer ✔✔Step 1: Calculate
test statistics and corresponding P values for each of the m comparisons
Step 2: Order the P values from smallest to largest: p1,p2,...,pm. Label the corresponding comparisons:
C1,C2,...Cm
Step 3: Compare p1 and alpha(a)/m
(a) If p1 > a/m, then stop. Conclude that there is no evidence of differences between any of the means.
Procedure is done
(b) p1 < or = a/m, then reject Ho for C1. Continue to next step.
Step 4: Compare p2 and a/(m-1)
(a) If p2 > a/(m-1), then stop. There is no evidence of differences between any of the means in the
remaining comparisons. Procedure is done.
(b) p2 < or = a/(m-1), then reject Ho for C2. Continue to next step.
Step 5: Compare p3 and a/(m-2)
, (a) If p3 > a/(m-2), then stop. There is no evidence of differences between any of the means in the
remaining comparisons. Procedure is done.
(b) p3 < or = a/(m-2), then reject Ho for C3. Continue to next step
Continue until procedure requires you to stop or until all P values have been compared
Kruskal-Wallis Test - correct answer ✔✔The nonparametric analog to a Model I One-Way ANOVA. We
would use if it we reject the assumption of normality for the data.
Randomized-Complete Block Design ANOVA - correct answer ✔✔Used to extend paired experimental
designs to accommodate making more than just two measurements on the same individuals. Also called
Repeated Measures ANOVA.
Model Assumptions:
1. Each observation constitutes a random, independent sample from a population with mean u_ij. There
are k x b of these populations sampled.
2. Each of the k x b populations is normal and with the same variance.
3. The treatment and block effects are additive, that is, there is no interaction (synergy or interference)
between blocks and treatments.
Factorial-Design Two-Way ANOVA - correct answer ✔✔Model Assumptions:
1. The observations in each cell constitute an independent random sample of size n from a population
with mean u_ij
2. Each of the population represented by the cell samples is normal and has the same variance.
Friedman k-sample Test: Matched Data - correct answer ✔✔The nonparametric analog to the
Randomized-Complete Block Design ANOVA
Linear Regression - correct answer ✔✔Examines the amount of variability in one variable (Y) that is
explained by the changes in another variable (X). Typically used in situations in which we have control of
X and can measure it essentially without error.
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