MPH TEST || ALL PASSED ANSWERS!!
Which of the following types of bias is most commonly associated with a case-control study?
correct answers Recall bias
A new non-invasive screening test is proposed that is claimed to be able to identify patients
with impaired glucose tolerance based on a battery of questions related to health behaviors.
The new test is given to 75 patients. Based on each patient's responses to the questions they
are classified as positive or negative for impaired glucose tolerance. Each patient also submits
a blood sample and their glucose tolerance status is determined. The results are tabulated
below
What is the sensitivity of the screening test?
What is the false positive fraction of the screening test? correct answers Sensitivity = #(true
positives)/(#(true positives)+#(false negatives)) = 17/(17+8) = 17/25 = 0.68
Answer: 0.68
False positive fraction = #(false positives)/(#(false positives)+#(true negatives)) =13/(13+37)
= 13/50 = 0.26
Answer: 0.26
A study is designed to evaluate the impact of a daily multivitamin on students' academic
performance. One hundred sixty students are randomly assigned to receive either the
multivitamin or a placebo and are instructed to take the assigned drug daily for 20 days. On
day 20, each student takes a standardized exam and the mean exam scores are compared
between groups. This study is an example of a correct answers Randomized Control Trial
When estimating sample size, it is not important for researchers to account for attrition or loss
of participants during follow-up. correct answers True
Five hundred people are enrolled in a 10-year cohort study. At the start of the study, 50 have
diagnosed CVD. Over the course of the study, 40 people who were free of CVD at baseline
develop CVD. What is the cumulative incidence of CVD over 10 years? correct answers A.
Cumulative incidence of CVD over 10 years
Cumulative incidence 40/450=.0888 x 100=8.9%
B. The prevalence of CVD at base line
a. Prevalence baseline=50/500 .1 x 100= 10%
C. The prevalence of CVD at ten years is
a. Prevalence 10 year 90/500= .18 x 100=18%
What is the median blood glucose level of the following data set collected from 8 individuals:
89, 95, 99, 102, 107, 108, 111, and 119? correct answers Median=107
True or False? The mean is the best measure of central tendency for a data set measuring
low-density lipoprotein (LDL) in which the individual measures of LDL were 100, 101, 105,
107, 109, 110, and 111. correct answers True
True or False? An r value of -0.8 indicates a weak negative association correct answers False
Which of the following types of bias is most commonly associated with a case-control study?
correct answers Recall bias
A new non-invasive screening test is proposed that is claimed to be able to identify patients
with impaired glucose tolerance based on a battery of questions related to health behaviors.
The new test is given to 75 patients. Based on each patient's responses to the questions they
are classified as positive or negative for impaired glucose tolerance. Each patient also submits
a blood sample and their glucose tolerance status is determined. The results are tabulated
below
What is the sensitivity of the screening test?
What is the false positive fraction of the screening test? correct answers Sensitivity = #(true
positives)/(#(true positives)+#(false negatives)) = 17/(17+8) = 17/25 = 0.68
Answer: 0.68
False positive fraction = #(false positives)/(#(false positives)+#(true negatives)) =13/(13+37)
= 13/50 = 0.26
Answer: 0.26
A study is designed to evaluate the impact of a daily multivitamin on students' academic
performance. One hundred sixty students are randomly assigned to receive either the
multivitamin or a placebo and are instructed to take the assigned drug daily for 20 days. On
day 20, each student takes a standardized exam and the mean exam scores are compared
between groups. This study is an example of a correct answers Randomized Control Trial
When estimating sample size, it is not important for researchers to account for attrition or loss
of participants during follow-up. correct answers True
Five hundred people are enrolled in a 10-year cohort study. At the start of the study, 50 have
diagnosed CVD. Over the course of the study, 40 people who were free of CVD at baseline
develop CVD. What is the cumulative incidence of CVD over 10 years? correct answers A.
Cumulative incidence of CVD over 10 years
Cumulative incidence 40/450=.0888 x 100=8.9%
B. The prevalence of CVD at base line
a. Prevalence baseline=50/500 .1 x 100= 10%
C. The prevalence of CVD at ten years is
a. Prevalence 10 year 90/500= .18 x 100=18%
What is the median blood glucose level of the following data set collected from 8 individuals:
89, 95, 99, 102, 107, 108, 111, and 119? correct answers Median=107
True or False? The mean is the best measure of central tendency for a data set measuring
low-density lipoprotein (LDL) in which the individual measures of LDL were 100, 101, 105,
107, 109, 110, and 111. correct answers True
True or False? An r value of -0.8 indicates a weak negative association correct answers False
