Answer:
a) Standard error = 0.5
b) 99% Confidence interval: (19.2125,21.7875)
Step-by-step explanation:
We are given the following in the question:
Population mean = 20.50 mpg
Sample standard deviation = 3.00 mpg
Sample size , n = 36
Standard Error =

99% Confidence interval:

Putting the values, we get,


Let's see what to do buddy...
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Reminder:

So we need to just Multiply above equations like this :




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And we're done.
Thanks for watching buddy good luck.
♥️♥️♥️♥️♥️
Answer:
its D i do belive
Step-by-step explanation:
You can set proportions up 4 ways.
See picture. Sorry you got the wrong answer.