MPH Test Questions | 100% Correct Answers |
Verified | Latest 2024 Version
Which of the following types of bias is most commonly associated with a case-control study? - ✔✔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? - ✔✔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 -
✔✔Randomized Control Trial
When estimating sample size, it is not important for researchers to account for attrition or loss of
participants during follow-up. - ✔✔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? - ✔✔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? - ✔✔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. -
✔✔True
True or False? An r value of -0.8 indicates a weak negative association - ✔✔False
The following table displays descriptive statistics on the participants involved in a clinical trial.
Characteristic New Compound Placebo p-value
Mean age (years) 47.2 46.1 0.7564
Men (%) 44% 59% 0.0215
Mean educational level (years) 13.1 14.2 0.6898
Mean annual income $36,560 $37,470 0.3546
Mean body mass index (BMI) 24.7 25.1 0.0851
Select which characteristic(s) are significantly different between groups? - ✔✔There is a statistically
significant difference in the proportions of male (p=.0215) and a marginally significant difference in mean
body mass index (p=.0851). None of the other characteristics are significantly different between groups
using a 5% level of significance
With a binomial distribution with n = 25 and p = 0.48, which is larger? - ✔✔P(12 successes)
Verified | Latest 2024 Version
Which of the following types of bias is most commonly associated with a case-control study? - ✔✔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? - ✔✔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 -
✔✔Randomized Control Trial
When estimating sample size, it is not important for researchers to account for attrition or loss of
participants during follow-up. - ✔✔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? - ✔✔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? - ✔✔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. -
✔✔True
True or False? An r value of -0.8 indicates a weak negative association - ✔✔False
The following table displays descriptive statistics on the participants involved in a clinical trial.
Characteristic New Compound Placebo p-value
Mean age (years) 47.2 46.1 0.7564
Men (%) 44% 59% 0.0215
Mean educational level (years) 13.1 14.2 0.6898
Mean annual income $36,560 $37,470 0.3546
Mean body mass index (BMI) 24.7 25.1 0.0851
Select which characteristic(s) are significantly different between groups? - ✔✔There is a statistically
significant difference in the proportions of male (p=.0215) and a marginally significant difference in mean
body mass index (p=.0851). None of the other characteristics are significantly different between groups
using a 5% level of significance
With a binomial distribution with n = 25 and p = 0.48, which is larger? - ✔✔P(12 successes)
