The mean track length for this rock specimen is between 10.463 and 13.537.
What is Confidence Interval?
This refers to the probability that a population parameter will fall between two set values.
We were told that there was 99% confidence interval for the mean track length for rock specimen. It can then be calculated using the formula:
M± (t×s/√N)
where
M = average track length = 12 μm
t = two tailed t-score in 99% confidence interval = 2.977
s = standard deviation =2 μm
N = total number of tracks = 15
We can substitute the parameters into the formula
12± (2.977× 2/√15) = 12±1.537
The mean track length for this rock specimen is between 10.463 and 13.537.
learn more about of Confidence Interval here
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