Which of the following statements is true? Question 5 options: It is impossible for critical values to be negative. It is possible to make a confidence interval with 100% confidence. The critical value of a confidence interval for a population mean is a normal distributed Z value. If we switch the point estimate for the confidence interval of comparing independent means from (sample mean 1 - sample mean 2) to (sample mean 2 - sample mean 1), the standard error will be different