Question #5
The margin of error associated with the confidence interval is
Given that
"margin\\ of\\ error=1.729\\cdot{12\\over \\sqrt{20}}\\approx4.64"
Question #6
The t procedures can be used even for clearly skewed distributions when the sample is large, roughly n ≥ 40 (or 50).
Correct answer
b. You may use the t procedure, provided your sample size is large, say at least 50.
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