When σ is unknown, the margin of error is computed by using:
A) normal distribution.
B) t-distribution.
C) the mean of the sample.
D) The margin of error is also unknown.

Question

Quizplus · Accepted Answer

When σ (the population standard deviation) is unknown and the sample size is relatively small, the t-distribution is used instead of the normal distribution to compute the margin of error. This accounts for the added uncertainty of estimating the population standard deviation with the sample standard deviation.

When σ Is Unknown, the Margin of Error Is Computed