QuestionEmilio took a random sample of $n=12$ giant Pacific octopi and tracked them to calculate their mean lifespan. Their lifespans were roughly symmetric with a mean of $\bar{x}=4$ years and a standard deviation of $s_{x}=0.5$ years. He wants to use this data to construct a $t$ interval for the mean lifespan o! this type of octopus with $90 \%$ confidence.
What critical value $t^{*}$ should Emilio use?