(Birth Weights) Does ability enhanced TRT appear to affect the birth weight of a Statopia baby?

(A random sample of the birth weights of 100 baby has a mean of 3000 g and a standard deviation of 500 g. These babies were born to mothers who did not use ability enhanced TRT during their pregnancies. Construct a 99% confidence interval estimate of the mean birth weight for all such babies.

Is this mean or proportion question?

Can we Use Z to find confidence interval?

What is the Z value for the above confidence interval?

Please find the Margin of Error for 99% confidence interval estimate of the mean birth weight for all babies whose mothers did not use TRT during their pregnancies.

The upper bound for the above confidence interval is?

The lower bound for the above confidence interval is

Should we Use Z or t to find confidence interval?

Please find the Margin of Error for 99% confidence interval estimate of the mean birth weight?