A hypothesis for an experimental or causalA hypothesis for an experimental or causal-comparative study: A hypothesis for correlational research. A hypothesis for descriptive research. A model for stating hypotheses for an experimental or causal-comparative study. Example: Research Hypothesis: Girls will achieve higher reading comprehension
Lead is an important metal for many types of businesses and industrial processes. Lead is most often used in the manufacturing sector (e.g., manufacturing products containing lead) but worker exposure can also occur in other industry sectors including construction and wholesale trade.
3 Gardening on Lead-and Arsenic-Contaminated Soils h Lead and arsenic in the environment Lead is a metallic element found everywhere in the human environment because of industri-alization. Humans have used it in some form since prehistoric times.