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, non-filtered, non-menthol, and non-light. Express the confidence interval in the format of E. (23.305,25.075)
mean = 23.69
n = 30
The confidence interval is__?__ + or -___?___.

Step-by-step explanation:

Given parameters

Z interval E = (23.305,25.075)

mean xbar = 23.69

number of samples n = 30

Required

we are to find the confidence interval for the Z interval given.

The formula for finding the confidence interval is expressed as shown below;

where;

xbar is the mean = 30

E is the margin of error

U =  upper limit = 23.305

L = lower limit = 25.075

The confidence interval is therefore expressed as

Hence the confidence interval is expressed as

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step-by-step explanation: