Epi Exam 3 - Biostatistics Practice Problems Flashcards
Researchers wished to test the possible effectiveness of an investigational drug versus placebo for patients with tinnitus. After randomization, both groups were treated with their allocated treatment for 1 month. At the end of the study-month, every person in each group was then surveyed to see if they had perceived any improvement in their symptoms. Improvement was captured by the researchers as Improvement/No Appreciable Improvement. Researchers wanted to compare the proportion of patients between each group that experienced improvement. Which statistical test would be appropriate for this particular analysis?
Contingency Coefficient Friedman McNemar Chi-Square Mann-Whitney
Chi-Square
Researchers wish to conduct a study of KCU graduate and medical students to determine the possible association between the amount of turkey consumed on Thanksgiving and the number of hours spent sleeping the next day. Researchers categorized the amount of turkey consumed as: 0 pieces; 1-2 pieces; 3-6 pieces; 6-8 pieces; nearly the entire bird! Researchers also categorized the sleep-time as: 1-5 hours; 6-10 hours; 11-20 hours; >20 hours. Which statistical test would researchers select to correlate the amount of turkey consumed and the number of hours slept, both as recorded in the study?
Repeated measures ANOVA Log rank Kruskal-Wallis Spearman correlation Fisher's exact
Spearman correlation
Researchers want to determine a possible association between the number of medical care visits for children between the ages of 8-16 years and various patient characteristics. Researchers collected data from hundreds of patients over the course of two years and included the number of medical care visits, gender, weight, height, hours of exercise per week, number of siblings, ethnicity, number of organized sports in which the child was involved, and the number of medications utilized. Which statistical test would be most appropriate for the researchers to select when utilizing the variables to predict the association between the data collected from the children and the number of medical visits they might expect between the ages of 8-16 years?
Linear regression ANOVA Chi-square Kaplan-Meier Wilcoxon signed rank
Linear regression
Researchers randomly selected 1,925 undergraduate students at a large university and grouped them by their current level of education that year (Freshman, Sophomore, Junior, Senior). Researchers then desired to compare the mean number of calories each group consumed during the 48-hours surrounding a final examination. Which statistical test would be most appropriate to compare this variable among the groups of undergraduate students?
Logistic regression Cox proportional hazard ANOVA Cochran Student-Newman-Keul
ANOVA
If a study was being conducted to test the effectiveness of a new weight loss medication, compared to placebo, which statistical test would be the most appropriate to select if the researchers desired to compare each study patients’ end-of-study body mass index (BMI) to their baseline BMI?
Cochran Friedman Logistic regression Chi-square Paired t-test
Paired t-test
