Question 1198014
test volume = 9.02 cubic centimeters.
sample mean = 8.10
sample standard deviation = .7
sample size = 12
t-score = (x - m) / s
x is the sample mean
m is the test mean
s is the standard error.
s = standard deviation of sample / square root of sample size = .7 / sqrt(12) = .2020725942.
t-score = (8.10 - 9.02) / s = -4.552819266.
the probability of getting a t-score with 11 degrees of freedom less than that is equal to .000413154.
this is significantly less than .01, or even .005.
the results of the test indicate that hippocampal volumes in alcoholic adolescents are strongly determined to be below the normal level.
the likelihood that the sample results are due to random variations in the mean of samples of the size indicated is extremely remote.
i confirmed by using an online t-test calculator.
the results are shown below:
<img src = "http://theo.x10hosting.com/2022/110801.jpg">