Question

Refer to the accompanying​ TI-83/84 Plus calculator display of a​ 95% confidence interval. The sample display results from using a simple random sample of the amounts of tar​ (in milligrams) in cigarettes that are all king​ size, nonfiltered,​ nonmenthol, and​ non-light. Express the confidence interval in the format of x overbarplus or minusE.

Answer 1

Data is not given in your question. So, I searched a bit for this question on the internet and I found a similar question, I don't whether the data is same or not, if not just follow the method I have used for your data.

Q.

Refer to the accompanying TI-83/84 Plus calculator display of a 95% confidence interval. The sample display results from using a simple random sample of the amounts of tar (in milligrams) in cigarettes that are all king size, nonfiltered, nonmenthol, and non-light. Express the confidence interval in the format x overbarplus or minusE.

Z-Interval:

(19.779,22.441)

mean=21.11

n = 30

E = (U-L)/2

= (22.441 - 19.779)/2

= 1.331

Confidence Interval : [21.11 - 1.331, 21.11 + 1.331]

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