When a 90% confidence interval with the sample size n, remaining the same, is calculated instead of a 95% confidence interval, the margin of error will be: a) the same, b) smaller, c) larger. Support your choice with a brief explanation.
As the confidence level increases, the margin of error increases.
Margin of error = Critical value x Standard deviation of the statisticMargin of error = Critical value x Standard error of the statistic
Hence, at 95% confidence their is more margin of error than at 90% confidence.
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