Which of the following is not true about the Student's t distribution?
A)It has more area in the tails and less in the center than does the normal distribution.
B)It is used to construct confidence intervals for the population mean when the population standard deviation is known.
C)It is bell shaped and symmetrical.
D)As the number of degrees of freedom increases,the t distribution approaches the normal distribution.

Question

Quizplus · Accepted Answer

The Student's t distribution is used to construct confidence intervals for the population mean when the population standard deviation is unknown or when the sample size is small (n<30). When the population standard deviation is known, the Z-distribution is used to construct confidence intervals.

Which of the Following Is Not True About the Student's