Amajor impact of the columbian exchange on western europe was the introduction of

Arecent poll of 500 residents in a large town found that only 36% were in favor of a proposed referendum to build a new high school. find the margin of error for this poll if we want 95% confidence in our estimate of the percentage of residents in favor of this proposed referendum.

Which statement is a good description of a model? a) models are a description of nature based only on one or two variables. b) models are testable ideas but they are not very to most people. c) models are a description of nature that predicts more accurately than real events. d) models are an approximiation of a real system that omits all but most essential variables in a system.

Afederally funded research study involving children 8 to 12 years old involves collecting a single voided urine sample to assess the frequency of asymptomatic proteinuria (higher amounts of protein in the urine without any signs or symptoms of illness or infection). your irb has determined that assent of children age 8 and older is required for the study. a 10-year-old firmly declined to participate in the study described above. which of the following procedures best describes the action to be taken by the investigator? a. honor the child's decision b. consent both of the child's parents instead c. consent one of the child's parents instead d. request the child reconsider assenting to the study