Consider a 100 (1 )% confidence interval for based on a normal random sample of size n. (a) If everything about the confidence interval remains the same except n increases, will the interval become wider, narrower, or stay the same? (b) If everything about the confidence interval remains the same except increases, will the interval become wider, narrower, or stay the same? (c) If everything about the confidence interval remains the same except X increases, will the interval become wider, narrower, or stay the same? (d) If everything about the confidence interval remains the same except increases, will the interval become wider, narrower, or stay the same?