# A company that dumps its industrial waste into a river has to meet certain restrictions. One particular constraint involves the

## Question:

(a) Find a two-sided 95% confidence interval for the mean dissolved oxygen, and interpret it.

(b) What assumptions do you need to make to answer part (a)?

(c) Suppose that the environmental standards stipulate a minimum of 9.5 ppm of average dissolved oxygen. Is the company violating the standard? Test at a level of significance a of 0.05.

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## Fundamentals of quality control and improvement

**ISBN:** 978-0470226537

3rd edition

**Authors:** amitava mitra

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