Which of the following statements are true?
a. When testing a claim about a population mean m, the P-value method, critical value method, and confidence interval method are all equivalent in the sense that they always yield the same conclusions.
b. When testing a claim about a population proportion p, the P-value method, critical value method, and confidence interval method are all equivalent in the sense that they always yield the same conclusions.
c. When testing a claim about any population parameter, the P-value method, critical value method, and confidence interval method are all equivalent in the sense that they always yield the same conclusions.