you want to compute a 95% confidence interval for the mean of a population with unknown population standard deviation. the sampl
e size is 30. the value of t* you would use for this interval is a) 1.645 b) 1.699 c) 1.96 d) 2.045
1 answer:
<h3>Answer: d) 2.045</h3>
Use either a table or a calculator to find this value. The t table should be found in the back of your stats textbook (if you dont have a textbook then you can find a free online t table by searching it out). See the attached image below for how I used a table to get the answer.
If you use a calculator, then you'll use the inverse T function. If n > 30, then you would be able to use a Z distribution instead of a T distribution which would mean that z = 1.96 is the critical value used. But instead, n = 30 does not make n > 30 true. Keep in mind that the degrees of freedom (df) are df = n-1 = 30-1 = 29.
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