Mathematics, 14.01.2020 01:31 stormhorn5108

We use a t distribution for inference about a population mean instead of the standard normal distribution:

a. if we do not know the population mean and must use the sample mean.
b. if the original population does not have a normal distribution.
c. if we do not have a simple random sample.
d. if we do not know the population standard deviation and must use the sample standard deviation.

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We use a t distribution for inference about a population mean instead of the standard normal distrib...