Health and Safety Flashcards
Who has the most responsibility for the health and safety of employees?
Employer
What is the definition of mode
The mode is the most common value in a series.
For example, is seven injured workers are off work the following number of days 5,5,7,2,10,22 and 14
Putting the series in order 2,5,5,7,10,14 and 22 the mode, or most common number of days off due to injury is 5.
Definition of Median
The median is the middle value in a series. For example, if seven injured workers are off work for the following number of days; 5, 5, 7, 2, 10, 22, and 14.
Putting the series in order: 2, 5, 5, 7, 10, 14, and 22 the median number of days taken off by an injured worker is 7.
The median is often a more meaningful measure of central tendency when there are large extremes in the range of the variables.
Definition of Mean
The mean, or arithmetic mean, is the sum of a list of numbers, divided by the number of numbers. The mean is also known as the average. For example, if seven injured workers are off work for the following number of days; 5, 5, 7, 2, 10, 27 and 14.
M = (5 + 5 + 7 + 2 + 10 + 27 + 14) / 7 = 70 / 7 = 10
The average number of days taken off by an injured worker is 10.
Standard Deviation
The standard deviation (SD) of a set of numbers is the root mean square of the set of deviations between each element of the set and the mean of the set.1 Simply put, the SD is a measure of the spread of numbers, or the “mean of the mean”.2 The standard deviation is calculated as follows:
Find the mean (average of the numbers)
Subtract the mean and square the result for each of the numbers
Work out the mean of each of those squared differences
Find the square root of that
These steps are translated into this equation:
SD=(((x1−M)2 + (x2 −M)2 + … + (xn−M)2)/(n−1))½
Which evidence is collected first in an incident investigation?
Physical Evidence - any investigation the physical evidence is recorded first because the incident site may be subject to rapid change.
Describe some examples of physical evidence?
-The positions of injured
workers and witnesses
-The equipment, materials, and chemicals in use
-The safety devices in use
-The position of safeguards and controls
-The damage to equipment
-Housekeeping conditions
-Lighting
-Noise level
-Temperature or weather conditions, if outside
-Time of day
-Taking photographs and making sketches can preserve the site for later referral.
Define Material Flow Analysis (MFA)
Material flow analysis (MFA) is a systematic assessment of the flows and stocks of materials within a system, defined in space and time.”1 It connects the sources, pathways, and intermediate and final sinks of a material.
Calculate the severity rate for a company that had five knee strains (7 days lost), 2 finger cuts (1 day lost) and one case of a worker getting dust fragments in the eye (2 days lost) in a year in which there was 922,000 hours worked
2.17
Why is controlling occupational exposure in laboratories is particularly challenging?
Because there are often numerous hazardous substances being used, and the toxicological information associated with some of these substances is often not well established.
What is the main purpose of a GFCI?
To sense the leakage of current large enough to cause serious
personal injury
Calculate the severity rate for a company that had 22 days lost in a five-year period in which it worked 1,500,000 hours.
2.93
When should inspections be scheduled?
When the inspector will have the best opportunity to see work operations and work processes without much interruption
What is The NIOSH lifting equation used for?
The NIOSH lifting equation is used as a general guide to analyze materials handling.
