Figure 1. On many standardized assessments the publishers base the standard score on a distribution with a mean of 100 and a standard deviation of 15. A score of 100 on such a test (e.g., WJIIIDRB) means that if the student scored in the middle of the distribution (Mercer & Pullen, 2009). standard score is based on a normal distrbution with a mean and a standard deviation (see Figure 1). The black line at the center of the distribution represents the mean. The turquoise lines represent standard deviations. Figure 1.
Labor unions have a long and colorful history in the United States. To some people, they conjure up thoughts of organized crime and gangsters like Jimmy Hoffa. To others, labor unions represent solidarity among the working classes, bringing people together across many professions to lobby for better rights, wages and benefits.
Trade unions are independent organisations that represent workers to their employers. If you join a trade union, you are joining a group that will negotiate workplace issues such as salary, hours of work, and other conditions, on your behalf.orkers who join a trade union have the benefit of being part of an organised group who pull together around workplace issues. Topics ranging from paid maternity leave to salary increases to safety in the workplace are all dealt with as a group. You donât have to tackle them on your own, as an individual.