A Researcher Conducted a Study to See If There Are

question 20

Multiple Choice

A researcher conducted a study to see if there are differences in mean prostate-specific antigen (PSA) levels between men aged >50 years (μ₁) and men aged 50 years (μ₂) . The researcher hypothesizes that there will be a difference in mean PSA between the two groups. We are assuming that PSA levels have a symmetric distribution. The 95% confidence interval for the difference in mean PSA between age groups was (0.2, 6.0) . What can you conclude from this confidence interval?

• A) We are 95% confident that the estimated mean PSA level for men aged years is 0.2 and for men >50 years is 6.0.
• B) We are 95% confident that mean PSA levels between the two groups are the same.
• C) We are 95% confident that the mean PSA levels between the two groups are different.
• D) We do not have enough information to form a conclusion.

Understand the theoretical basis and assumptions underlying the Friedman test.

Apply critical thinking to evaluate the suitability of statistical tests based on research design and data characteristics.

Understand how to infer differences in population locations using nonparametric tests.

Understand the principle and application of the Wilcoxon signed rank test for matched pairs.

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