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 mean + or - e.
zinterval
(23.305,25.075)
mean=23.69
n = 30
the confidence interval is +

The confidence interval is

Step-by-step explanation:

We have given,

The Z interval (23.305,25.075)  

Mean

Sample n=30

To find : The confidence interval?

Solution :

We know, The confidence interval is in the format of

E denotes the margin of error,

Where, U is the upper limit U=25.075

L is the lower limit L=23.305

Substitute the value of E and in the formula,

Therefore, The confidence interval is

answer: 7 x 2/5 = 2.8 hours, is your answer. your welcome! : 3

step-by-step explanation: first work out how long it took to hose 1/7 of the lawn which is 2/5 hours. times that by 7 to get the whole lawn.

sorry i don't know the other answer. i didn't learn what a proportional relationship is.