Cola-Coca needs their automatic filling machines to put on average 15 ounces of soda to each bottle. Shutting down the machine is very costly, but the company will act on this if there is very strong evidence that the fill rate is significantly different than 15 ounces (both under-filling and overfilling).

Let denote the average volume of soda filled in each bottle. Based on the information, what should be the appropriate null and alternative hypotheses for the purpose of your analysis?

a.

Ho: 15; Ha: 15.

b.

Ho: 15; Ha: > 15.

c.

Ho: = 15; Ha: 15.

d.

Ho: = 15; Ha: > 15.