We use a t distribution for inference about a population mean instead of the standard Normal...
We use a t distribution for inference about a population mean instead of the standard Normal distribution:
if we do not know the population mean and must use the sample mean.
if the original population does not have a Normal distribution.
if we do not have a simple random sample.
if we do not know the population standard deviation and must use the sample standard deviation.
Homework Answers
We use t distribution instead of Normal distribution, when population standard deviation is unknown and we use sample standard deviation.
Answer is option (d)
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