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A scientist hypothesizes that the temperature at which an alligator’s egg is incubated will determine whether the alligator will be male or female. The independent variable is
______________.
the temperature
A scientist hypothesizes that the temperature at which an alligator’s egg is incubated will determine whether the alligator will be male or female. The dependent variable is
______________.
the gender of the baby alligators
A scientist conducted an experiment to determine how the amount of salt in a body of water affects the number of plants that can live in the water. In this experiment the independent variable is _______________.
the amount of salt in the water
Aromatherapy uses aromatic materials, including essential oils, with claims for improving psychological or physical well-being. It is offered as a complementary therapy or as a form of alternative medicine. Aromatherapists, people who specialize in the practice of aromatherapy, utilize blends of supposedly therapeutic essential oils that can be used as topical application, massage, inhalation, or water immersion. There is no good medical evidence that aromatherapy can either prevent, treat, or cure any disease. Placebo-controlled trials are difficult to design, as the point of aromatherapy is the smell of the products. Aromatherapy is probably an example of pseudoscience.
true
Which of the following contains the steps of the scientific method in the correct order?
Ask a question, do background research, state your hypothesis, conduct an experiment, analyze date, make a conclusion
Postmenopausal hormone therapy is thought to increase the risk of breast cancer. A team of researchers examines this hypothesis. They gather extensive data on taking postmenopausal hormone therapy and the occurrence of breast cancer and conclude that a causal relation exists. After the results are published, other researchers criticize it by arguing that the studied group have a higher percentage of older women and a higher percentage of women with a family history of the disease compared to the control group. Both old age and family history are known risk factors. If correct, this criticism shows that the said study suffered from ______________.
uncontrolled variables
A controlled experiment tests only _______factor at a time by using a comparison of a control group and an experimental group.
one
A student examined the characteristics of a leaf and then identified the plant species. Which statement represents a conclusion rather than an observation?
it is a silver maple leaf
Which of the following examples supports the saying “Correlation does not prove causation”?
Ice cream sales and sunglasses sold.
Researchers hired by a pharmaceutical company to test one of the company’s new medications are vulnerable to ________________.
bias
A student is conducting an investigation to determine the effect of temperature on the metabolism of yeast (Saccharomyces cerevisiae). Yeast and sugar are added to water, the gas produced is captured, and its volume is recorded. Which variables should be held constant during this investigation?
Mass of yeast and mass of sugar
Based on your observations, you suggest that the presence of water could accelerate the growth of bread mold. This is a/an ____________.
hypothesis
Shopping at a farmers’ market, you notice that live animals are segregated at a different section from food. This is most closely associated with which step in the scientific method?
Making an observation
