MPH Comprehensive Exam Review Questions and Answers | Latest Version | 2024/2025 | Already Passed

MPH Comprehensive Exam Review Questions and Answers | Latest Version | 2024/2025 | Already Passed (Fictitious Data) Investigators conducted a study to evaluate the use of magnetic resonance imaging (MRI) in the diagnosis of brain attack. One hundred and sixty patients with brain attack confirmed by surgery were evaluated with MRI, as were 100 patients without brain attack. The MRI results were positive in 112 patients with brain attack and in 20 of the patients without the condition. What is the false-positive rate in this study? 70% 85% 80% 20% 30% FP = b/(b+d) 20% (Fictitious Data) Investigators conducted a study to evaluate the use of magnetic resonance imaging (MRI) in the diagnosis of brain attack. One hundred and sixty patients with brain attack confirmed by surgery were evaluated with MRI, as were 100 patients without brain attack. The MRI results were positive in 112 patients with brain attack and in 20 of the patients without the condition. What is the likelihood ratio positive of this test? 3.5 0.28 None of the above 0.2 0.7 3.5 Sensitivity / (1-Specificity) A case-control study can be described by which of the following characteristics: - The measure is the odds ratio - It uses a single point of observation - Exposure information is collected retrospectively - It is an analytic study - All of the above -None of the above All of the above A public heath scientist wanted to calculate the linear association between low density lipoprotein (LDL) and prostate specific antigen. The two variables are continuous but the data are not normally distributed. Which of the following statistical methods may be most appropriate? Simple linear regression Pearson's correlation coefficient Cox proportional hazards model Poisson regression Spearman correlation coefficient Spearman correlation coefficient A researcher wants to investigate if there is a difference in the survival rates between infant patients who received a heart transplant and those who did not. There were nine infants who needed a heart transplant, but only five suitable donors were identified. Which statistical test should be used in this case? Independent t-test Spearman's correlation McNemar's test Fisher's exact test Chi-square test Fisher's exact test African-American race/ethnicity is a known risk factor for hypertension. A study was conducted to determine the association between hypertension and salt intake in a sample of 250 white and 250 black males. The investigators utilized logistic regression model for their analysis in order to generate the coefficients (β) to relate hypertension to salt intake (X1) and hypertension to race (X2). What is the accurate interpretation of β1? Log odds of hypertension associated with salt intake Log odds of hypertension among the unexposed None of the above Change in the mean hypertension with a unit change is salt intake given that race is held at constant Log odds of the hypertension associated with race