A random sample of 16 pharmacy customers showed the waiting
times below (in minutes). Also, the sample is from a normal
population. Note that σ is unknown. 21 22 22 17 21 17 23 20 20 24 9
22 16 21 22 21 The sample mean is 19.875 and the sample standard
deviation is 3.65. Which of the following represents the 80 percent
confidence interval for µ?
Select one:
a. [13.75, 25.25]
b. [18.65, 21.10]
c. [19.55, 20.425]
d. [18.8,...