How to find margin of error.?
I keep using my formula and I keep getting an error, I’m screwing up somewhere, I need a little bit of help.
Mean systolic blood pressure for a sample of n = 12 men is x = 150, the standard deviation is s = 30 and 95% confidence interval.
Tagged with: 12 men • blood pressure • confidence interval • little bit • standard deviation
Filed under: how to lower blood pressure
The formula is
m ± ts/√n
where m is the sample mean
s is the sample standard deviation
n is the sample size
t is the value for 95% confidence and n – 1 degrees of freedom
The t value for this problem is 2.201. The interval is
150 ± (2.201)(30)/√12
= 150 ± 19.06121914
= (130.9387809,169.0612191)
= (130.94,169.06) rounded off.