Question 1

Which of the following best describes an independent variable in a nutrition research study?

Accepted Answer

The variable that is manipulated or controlled by the researcher.

Question 2

In a study examining the effect of dietary fiber intake on blood glucose levels, which is the dependent variable?

Accepted Answer

Blood glucose levels

Question 3

When graphing the results of a nutrition experiment, on which axis should the independent variable be plotted?

Accepted Answer

On the x-axis

Question 4

A researcher wants to compare the average vitamin C intake between two groups. Which type of graph is most appropriate?

Accepted Answer

Bar graph

Question 5

Which of the following scenarios is best visualized using a line graph?

Accepted Answer

Showing the trend of average daily calorie intake over a 12-month period

Question 6

A study reports a p-value of $$0.03$$ when comparing two diets. What does this indicate?

Accepted Answer

There is a 3% chance that the observed difference is due to random variation, suggesting statistical significance.

Question 7

Which of the following p-values would be considered statistically significant at the $$\alpha = 0.05$$ level?

Accepted Answer

$$0.04$$

Question 8

What does a 95% confidence interval represent in the context of a nutrition study?

Accepted Answer

If the study were repeated many times, 95% of the calculated intervals would contain the true population parameter.

Question 9

A study finds a relative risk (RR) of $$1.5$$ for developing heart disease in people who consume high amounts of saturated fat compared to those who do not. How should this be interpreted?

Accepted Answer

People who consume high amounts of saturated fat have a 50% higher risk of developing heart disease.

Question 10

If a 95% confidence interval for an odds ratio (OR) is $$0.8 to$$ $$1.2$$, what can be concluded?

Accepted Answer

There is no statistically significant association because the interval includes $$1.$$

Question 11

A hazard ratio (HR) of $$0.6 is $$reported for mortality in a group taking a new supplement compared to a control group. What does this mean?

Accepted Answer

The supplement group has a 40% lower risk of mortality compared to the control group.

Question 12

Which of the following is an example of graphical manipulation?

Accepted Answer

Truncating the y-axis to exaggerate differences between groups.

Question 13

A nutrition study reports a p-value of $$0.08. $$What is the correct interpretation at the $$\alpha = 0.05$$ significance level?

Accepted Answer

The result is not statistically significant.

Question 14

Which of the following best describes the y-axis in a typical nutrition research graph?

Accepted Answer

It represents the dependent variable.

Question 15

A study finds an odds ratio (OR) of $$2.0$$ for obesity in children who consume sugar-sweetened beverages compared to those who do not. What does this mean?

Accepted Answer

Children who consume sugar-sweetened beverages are twice as likely to be obese.

Question 16

Which of the following is a correct formula for calculating relative risk (RR)?

Accepted Answer

$$RR = \frac{	ext{Incidence in exposed group}}{	ext{Incidence in unexposed group}}$$

Question 17

A researcher presents a graph with error bars. What do these error bars most commonly represent?

Accepted Answer

The standard deviation or standard error of the mean

Question 18

If a study reports a hazard ratio (HR) of $$1.0$$, what does this indicate about the risk between two groups?

Accepted Answer

There is no difference in risk between the two groups.

Question 19

Which of the following is a common misconception about p-values?

Accepted Answer

A p-value indicates the probability that the null hypothesis is true.

Question 20

A study reports a relative risk (RR) of $$0.7$$ for developing diabetes in people who exercise regularly compared to those who do not. What does this mean?

Accepted Answer

Regular exercisers have a 30% lower risk of developing diabetes.

Study Guide: Tools for Nutritional Research

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