In which of the following situations should the t distribution be used?

a. When the population is not normally distributed.

b. When the sample size is less than 30.

c. Only when the population mean is 0.

d. When the sample standard deviation is used to estimate the population standard deviation.

lyrics b

Step-by-step explanation:

t - student distribution should be use when dealing with normal distribution but the sample from the population is minor than 30. Curves for t-student are similar to the curve for normal distribution flattened and with much more area under tails and as n (sample number) increase the cuve become more and more similat to normal curve