Which of the following is true of confidence intervals?
A)Two quantities and c are required to construct the confidence intervals.
B)To obtain the value c in the confidence interval, only the degrees of freedom need to be known.
C) Confidence intervals are also called interval estimates.
D) A constructed confidence intervals will always contain the population parameter .

Question

Which of the following is true of confidence intervals?
A)​Two quantities and c are required to construct the confidence intervals. 
B)To obtain the value c in the confidence interval, only the degrees of freedom need to be known. 
C) Confidence intervals are also called interval estimates. 
D) ​A constructed confidence intervals will always contain the population parameter .

Quizplus · Accepted Answer

Confidence intervals are also known as interval estimates. Option A is incorrect as only one quantity, the level of confidence, is required to construct confidence intervals. Option B is incorrect as the value of c, known as the critical value, depends on the level of confidence and the sample size, in addition to the degrees of freedom. Option D is incorrect as confidence intervals provide a range of plausible values for the population parameter, but it is not guaranteed to contain the true value. Confidence intervals are also called interval estimates.

Which of the Following Is True of Confidence Intervals