Question

19 multiple choice 5 points
which statement best describes a hypothesis?
a hypothesis is the process of making careful observations.
the conclusion drawn from the results of an experiment is part of a hypothesis.
a hypothesis serves as a basis for determining what data to collect when designing an experiment.
the facts collected from an experiment are written in the form of a hypothesis.
20 multiple choice 5 points
which source would provide the most reliable information for use in a research project investigating the effects of antibiotics on disease causing bacteria?
the local news section of a newspaper from 1993
a news program on national television about antigens produced by various plants
a current professional science journal article on the control of pathogens
an article in a weekly news magazine about reproduction in pathogens
21 multiple choice 5 points
henry read a web site that claimed that creatures from other planets landed on earth.
which scientific skill should henry first use after reading the web site?
communicate this news to everyone he knows
generate a hypothesis to explain how the creatures got to earth
ask questions and try to find other resources that support this claim
identify the variables that would allow the creatures to survive on earth

Explanation:

• Question 19: A hypothesis is a proposed explanation made on the basis of limited evidence as a starting point for further investigation. It helps in designing an experiment by indicating what data to collect.
• Question 20: A current professional science journal article is peer - reviewed and based on research, making it the most reliable source for scientific information.
• Question 21: When presented with an extraordinary claim, the first step is to ask questions and look for other sources of information to verify or refute the claim.

Answer:

• 19: C. A hypothesis serves as a basis for determining what data to collect when designing an experiment.
• 20: C. a current professional science journal article on the control of pathogens
• 21: C. ask questions and try to find other resources that support this claim