5. Research and Professional Practice

Biostatistics — Quiz

Test your understanding of biostatistics with 5 practice questions.

Practice Questions

Question 1

In a study investigating the effect of a new dietary intervention on weight loss, researchers collect data on participants' body weight before and after the intervention. To determine if there is a statistically significant reduction in weight, which of the following statistical tests would be most appropriate?

Question 2

A researcher is examining the relationship between daily intake of dietary fiber (in grams) and the incidence of colorectal cancer (yes/no) in a large cohort. Which of the following statistical techniques would be most suitable for modeling this relationship and predicting the probability of colorectal cancer?

Question 3

Consider a study where the mean systolic blood pressure (SBP) of a population is known to be $120 \text{ mmHg}$ with a standard deviation of $10 \text{ mmHg}$. If a new dietary intervention is hypothesized to reduce SBP, and a sample of $50$ participants shows a mean SBP of $115 \text{ mmHg}$ after the intervention, what would be the appropriate test statistic to use for a one-sample hypothesis test?

Question 4

A nutritionist is conducting a study to compare the effectiveness of three different low-carbohydrate diets on weight loss over a 6-month period. Participants are randomly assigned to one of the three diet groups. Which statistical test should be used to determine if there is a significant difference in mean weight loss among the three diet groups?

Question 5

In a clinical trial, researchers are investigating the efficacy of a new drug for reducing cholesterol levels. They report a $95\%$ confidence interval for the mean reduction in LDL cholesterol as $[10.5 \text{ mg/dL}, 18.2 \text{ mg/dL}]$. Which of the following is the most accurate interpretation of this confidence interval?