A random sample of n measurements was selected from a population with standard deviation = 19.4 and unknown mean . Calculate a 90% confidence interval for for each of the following situations: (rounded to 2 decimals) (a) n = 35, = 92.9 (b) n = 65, x = 92.9 (c) n = 80, = 92.9 (d) In general, we can say that for the same confidence level, increasing the sample size the margin of error (width) of the confidence interval. (Enter: "DECREASES", "DOES NOT CHANGE" or "INCREASES", without the quotes.)