A Researcher Is Conducting an Experiment to Evaluate a Treatment

question 48

Multiple Choice

A researcher is conducting an experiment to evaluate a treatment that is expected to increase the scores for individuals in a population.If the researcher uses a one-tailed test with α = .01,then which of the following correctly identifies the critical region?

• A)z > 2.33
• B)z > 2.58
• C)z < 2.33
• D)z < 2.58

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Definitions:

Cupric Ions

Ions of copper in a +2 oxidation state, commonly involved in various biological and chemical processes.

Tchebysheff's Theorem

A statistical theorem that specifies the minimum proportion of observations within a certain number of standard deviations from the mean for any distribution shape.

Empirical Rule

A statistical theorem stating that in the case of a normal distribution, almost entirely all the data will be situated within three standard deviations away from the average.

Population Mean

The average or central value of a set of numbers or measurements in the entire population under study.