Radiation Health and Safety Test Research Methods & Evidence-Based Practice 3

Question 1

A p-value of 0.03 most accurately means:

Accepted Answer

Results this extreme would occur 3% of the time if the null were true

Answer

The p-value is the probability of data at least this extreme assuming the null hypothesis is true.

Question 2

A 95% confidence interval for a relative risk is 0.8 to 1.4. What can be concluded?

Accepted Answer

The result is not statistically significant at the 0.05 level

Answer

An interval that includes 1.0 means no significant difference at the 0.05 level.

Question 3

Sensitivity of a screening test is defined as the proportion of:

Accepted Answer

People with the disease correctly identified as positive

Answer

Sensitivity is true positives divided by all people who actually have the condition.

Question 4

Specificity is calculated as:

Accepted Answer

True negatives divided by all without the disease

Answer

Specificity is the proportion of disease-free people correctly testing negative.

Question 5

A Type I error occurs when a researcher:

Accepted Answer

Rejects a true null hypothesis

Answer

A Type I error is a false positive: rejecting a null hypothesis that is actually true.

Radiation Health and Safety Test Practice Test