discuss in detail

$1-$ What is t$-$test?

$2-$What are the Types of t$-$Test?

$3-$ how can we use t$-$Test?

$4-$ What is the Purpose of using the t$-$Test?

$5-$ Explain how supply chain managers might make use of the t$-$test?

Note: please do not copy$-$paste please make sure you rephrase not just summaries if you take an example from other people.