Question: Technology and the Internet A computer supply store sells a wide variety of generic replacement ink cartridges for printers. A consumer group is concerned that the cartridges may not contain the specified amount of ink (30 ml). A random sample of 17 black replacement cartridges was obtained, and the amount of ink (in ml) in each is given in the table below.
![239_Internet.png](https://secure.tutorsglobe.com/CMSImages/239_Internet.png)
Assume the underlying distribution of ink amount is normal.
a. Find a 95% confidence interval for the true mean amount of ink in each black cartridge.
b. Is there any evidence to suggest the cartridges are underfilled? Justify your answer.