66. A journal article reports that a sample of size 5 was used as a basis for calculating a 95% CI for the true average natural frequency (Hz) of delaminated beams of a certain type. The resulting interval was

(229.764, 233.504). You decide that a con dence level of 99% is more appropriate than the 95% level used. What are the limits of the 99% interval? (Hint:

Use the center of the interval and its width to determine and s.)