If a sample containing 20 observations is taken from a normally distributed population and a 90% confidence estimate for $\mu$ is needed,the appropriate t-score is:
A) 2.12.
B) 1.746.
C) 2.131.
D) 1.729.
E) 2.602.

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The Answer of If a sample containing 20 observations is taken from a normally distributed population and a 90% confidence estimate for $\mu$ is needed,the appropriate t-score is:
A) 2.12.
B) 1.746.
C) 2.131.
D) 1.729.
E) 2.602.

If a Sample Containing 20 Observations Is Taken from a Normally