Calculate the two-sided 90% confidence interval for the population standard deviation sigma given that a sample of size n=15 yields a sample standard deviation of 6.77.
Your answer:
a) 4.78 < sigma <18.16
b) 7.79
c) 0.81 < sigma <9.16
d) 5:20 < sigma <9.88
e) 5.47
f) 4.33
g) 4.67
h) 2.59
i) 3.20
j) 5.09
