The following 10 observations are samples from a normal population: 5.1, 2.6, 3.4, 6.3, 2.8, 4.5, 5.9, 1.7, 3.7, 8.0.
a) Find the mean of this sample.
b) Find the standard deviation of this sample.
What is the formula to construct a confidence interval for the population mean?
a. 5 + zc/2(7)
b. z + tc/2,-1(7)
c. cz + zo/2(5)
d. dzttc/2,-1()
Find a 99% confidence interval for the population mean.