In interval estimation, the t distribution is applicable only when
A.the population has a mean of less than 30
B.the sample standard deviation is used to estimate the population standard deviation
C.the variance of the population is known
D.the standard deviation of the population is known
Answer:B
In interval estimation, the t distribution is applicable only when
A.the population has a mean of less than 30 B.the sample standard deviation is used to estimate the population standard deviation C.the variance of the population is known D.the standard deviation of the population is known