About 70 Percent of All Tornadoes in the United States

question 92

Multiple Choice

About 70 percent of all tornadoes in the United States develop from ____.​

• A)May to June
• B)March to July
• C)​March to May
• D)​April to August
• E)​April to June

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Definitions:

Experimenter Bias

A form of bias introduced by the experimenter whose expectations about the outcome of the experiment can be subtly communicated to the participants.

Subject Bias

A form of bias introduced into scientific or experimental research by participants' expectations, treatment, or response to the knowledge that they are being observed.

Sampling Effect

A statistical effect in which the observed variability is not representative of the underlying population due to the sample size or method of selection.

Placebo Effect

A phenomenon where individuals experience a perceived improvement in condition solely because they believe they are receiving treatment, despite no active therapeutic element being present.