Answer:
5
Step-by-step explanation:
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2 answers:
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Answer:
The 95% confidence interval is (135.0285 degrees, 189.9715 degrees).
Step-by-step explanation:
We have that to find our level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of .
So it is z with a pvalue of , so
Now, find M as such
In which s is the standard deviation of the sample. So
The lower end of the interval is the mean subtracted by M. So it is 162.5 - 27.4715 = 135.0285 degrees
The upper end of the interval is the mean added to M. So it is 162.5 + 27.4715 = 189.9715 degrees
The 95% confidence interval is (135.0285 degrees, 189.9715 degrees).