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What is statistical anomaly?
A statistical anomaly occurs when something falls out of normal range for one group, but not as a result of being in that group. For something less abstract: More members of Group A have a trait than members of Group B do, but members of Group B are just as capable of possessing that trait.
What is the most commonly used statistical index of variability in a group of scores is the?
It is the standard error.
Why is the random assignment of individuals to experimental and control groups important for an experiment?
Without random assignment there is a danger of systematic error - or bias - entering into the results. Statistical theory depends on the errors being random and independent error and that is no longer the case without random assignment. In fact, statistical experiments are often "double-blind": even the observer does not know which individual is in which group. This is to prevent unconscious or subconscious messages to affect the outcome (placebo effects).
To eliminate the influence of uncontrolled variables during experimentation?
establish a control group identical to the experimental group except for the variable being tested
How are statistics used by scientists?
I believe scientist use statistics as data to process certain actions from a measured group or population. This can determine certain out comes when test are done repeatedly to obtain an actual statistical outcome.
Why are control groups used in statistical studies?
Because its the group for which the idependent variable is help constand in a statistical study.
Why did mendels use pure lines in his experiment?
He needed a control group. *Apex*
What is statistical control?
A statistical technique used to eliminate variance in dependent variables caused by extraneous sources. In evaluation research, statistical controls are often used to control for possible variation due to selection bias by adjusting data for program and control group on relevant characteristics.
Why is a control group necessary in a scientific investagation?
A control group is needed to see how the sample responds under normal conditions
Why did mendels experiment use pure lines?
He needed a control group. *Apex*
What was the purpose of the pure lines Mendel used in his work?
He needed a control group.
A group's reported are more likely to become equal to the statistical probability of loss?
the larger the group, the more likely the statistical probability of loss will be equal
Why is a control needed in a scientific method?
Because In a scientific method there has to be a independent,controll,and dependent variable. A control group has to be in a scientific method cause ther is only one needed.
What did Cyril Ponnamperuna and his group discover?
The evolutionary molecular biologist and his group studies the evolutionary pathways needed to establish life on earth and was in his later years an exobiologist for NASA
What does a valid experiment must include?
a control group and statistical analysys of the resultsalso, to be considered valid, the results of a scientific experiment must be repeatable and still proven correct.
A statistical function commonly used to describe a group of data?
A group of data is a sample.
What are the 3 types of longitudinal studies?
The three main types of longitudinal studies are cohort studies, panel studies, and trend studies. Cohort studies follow a specific group of individuals over time, panel studies revisit the same group of individuals at multiple points, and trend studies analyze data collected from different samples at various time points.
