I have destroyed my written work and deleted my local pdf files/pictures

If I know the variance of my population, I should use a t-distribution when finding the confidence interval for the mean.

If I don’t know the variance of my population (i.e. unknown variance), there is no way to find a confidence interval on the mean unless I have at least 40 observations in my sample.

Under 1910.132(f), PPE training must be verified:

Which of the following represents the correct hierarchy of controls for hazard management?

PPE training must include which of the following?

According to 1910.132(d), the PPE hazard assessment must:

Respirators used voluntarily must still be evaluated for employee medical fitness.

The PPE hazard assessment must be certified in writing by the employer.

Employers are required to perform a written hazard assessment to determine the need for PPE.