Two confidence intervals from the same sample are (72.2, 77.8) and (71.3, 78.7). One estimate is at the 95 percent level, and the other is at the 99 percent level. Which is which? (Hint: consider the...

Two confidence intervals from the same sample are (72.2, 77.8) and (71.3, 78.7).  One estimate is at the 95 percent level, and the other is at the 99 percent level.  Which is which? (Hint: consider the critical z-score for each).

(a) (72.2, 77.8) is the 95 percent level.

(b) (72.2, 77.8) is the 99 percent level.

(c) This question cannot be answered without knowing the sample size.

(d) This question cannot be answered without knowing the sample standard deviation.

(e) This question cannot be answered without knowing both the sample size and standard deviation.