For the methods of this section, which of the following statements are true?

a. When testing a claim with ten matched pairs of heights, hypothesis tests using the P-value method, critical value method, and confidence interval method will all result in the same conclusion.

b. The methods of this section are robust against departures from normality, which means that the distribution of sample differences must be very close to a normal distribution.

c. If we want to use a confidence interval to test the claim that μ_d < 0 with a 0.01 significance level, the confidence interval should have a confidence level of 98%.

d. The methods of this section can be used with annual incomes of 50 randomly selected attorneys in North Carolina and 50 randomly selected attorneys in South Carolina.

e. With ten matched pairs of heights, the methods of this section require that we use n = 20.