Decision Theory and Hypothesis Testing Quiz

Statistical Tests

• To test the significance of the departure of an observed value in either a positive or a negative direction from the value indicated by the hypothesis, a two-tailed test should be used.

Standard Deviation

• The standard deviation for the given sample distribution (8, 6, 5, 25, 20, 34, 78, 12, 23, 45, 35) can be calculated using the formula.

Respiratory Health

• The primary factor responsible for dust gaining entrance to the alveolar regions of the lung is inhalation.

Coefficient of Variation

• The coefficient of variation is a relative measure of variability that is expressed as the ratio of the standard deviation to the mean.

Skin Impregnation

• Local or generalized grey-blue colored impregnation of the skin tissue is an indication of argyria, a condition caused by exposure to silver.

Permissible Exposure Levels

• The correct permissible exposure level for 2% crystalline quartz dust in the tunnel atmosphere is 0.05 mg/m³.

Radioisotopes

• A radioisotope with a half-life of 1 year will take 5 years to reduce the initial activity to less than 5%.

Exposure to Chemical Mixtures

• The worker's exposure to the mixture of toluene, acetone, and MEK can be calculated using the formula for mixed exposures: (12.5/50) + (200/500) + (100/200) = 0.25 + 0.4 + 0.5 = 1.15.

Gas Volume

• The volume of gas at 460 degrees Rankine can be calculated using the formula: V2 = V1 × (T2 / T1) = 150 ml × (460 + 460) / (120 + 460) = 242.5 ml.

Hearing Evaluation

• The effectiveness of hearing can be evaluated using the formula: [insert formula].