During the performance of an audit, which of the following are key considerations?
. What sampling plans may be necessary?
. Is the audit schedule progressing as planned?
. Is there a need for a technical specialist?
. Is the level of compliance satisfactory?

The probability of an accident for the head event "H" given below is:

Which table should be used to determine a confidence interval on the mean when standard deviation is NOT known and the sample size is 10?

Analysis of data on all product returns is important because
. Failure rates change with length of product usage.
. Changes in design and in customer use are often well reflected.
. Immediate feedback and analysis of product performance becomes available.

Which of the following is a valid null hypothesis?