The GPA of a sample of students in UCCB has sample mean 3.9106 and sample standard deviation 0.256, with 95% confidence interval (3.488,4.333). Which of the following is correct?
a. If we sample many times, the proportion of intervals computed that cover the true mean is about 95%.
b. There's a 95% chance that the true mean falls between 3.488 and 4.333.
c. The estimate is within 95% of the true mean.
d. The population has a normal distribution with mean 3.9106 and standard deviation 0.256.