Question: Here is Minitab output on a study of nitrate ion concentration (in micrograms per liter) in a specimen of water.

T Test/Mean:
Test of mu=0.492 vs mu not=0.492
Variable-Concent
N-10
Mean-0.50410
StDev-0.01600
SEMean-0.00506
T-2.39
P-0.04

T Confidence Intervals
Variable-Concent
N-10
Mean-0.50410
StDev-0.01600
SEMean-0.00506
95CI-(0.49265, 0.51555)

a) What conclusion can be drawn fro the t-test?

b) What conclusion can you draw from the CI? Does it support or contradict the T-Test?