Question: I attempted to solve this by using t procedures. In order to calculate the smallest sample size possible to achieve a 90% CI, I need

I attempted to solve this by using t procedures. In order to calculate the smallest sample size possible to achieve a 90% CI, I need t*. But I can't use the t distribution calculator without knowing the degrees of freedom, which is dependent upon n. So, I don't know how to go forward. Does anyone have advice?

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