Data on the blood cholesterol levels of 6 rats give mean = 85, s= 12. A 95% confidence interval for the mean blood cholesterol o
f rats under this condition is
a)72.4 to 97.6
b)73.0 to 97.0
c)75.4 to 94.6
d)72.4 to 94.6
2 answers:
The equation of this would be
The z-value for a 95% confidence level is equal to 1.96.
Then the lower limit would be:
And the higher limit would be:
Therefore, the answer is
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c)75.4 to 94.6
I hope I was able to explain it clearly. Have a good day :)
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The <em><u>correct answer</u></em> is:
c)75.4 to 94.6
Explanation:
The formula for a confidence interval is:
,
where μ is the mean, z is the z-score associated with the level of confidence we want, σ is the standard deviation, and n is the sample size.
Our mean is 85, our standard deviation is 12, our sample size is 6, and since we want 95% confidence, our z-score is 1.96:
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