A fish farmer selects a sample of fish from one of the ponds in which all of the tilapia were spawned at the same time. If the sample mean length is 6.2 inches, with a population standard deviation of 0.91 inches, what are the 90% confidence intervals for the true mean with sample sizes of 16 and 64?

Confidence Interval (%) 80 85 90 95 95.4 99 99.5 99.7 99.9
-value 1.282 1.440 1.645 1.960 2 2.576 2.807 3 3.291

a) [5.8, 6.6] and [6.0, 6.4]
b) [5.7, 6.7] and [6.1, 6.3]
c) [5.9, 6.5] and [5.9, 6.5]
d) [5.75, 6.65] and [5.95, 6.45].