At Age 8,Anna Takes an Intelligence Test and Is Found

question 7

Multiple Choice

At age 8,Anna takes an intelligence test and is found to have an IQ of 100.Two years later,Anna again takes the same test.If Anna is typical,you would predict that her IQ score on the second test would be about

• A) 80.
• B) 100.
• C) 120.

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Definitions:

Hypotheses

Formally proposed explanations for a phenomenon, which are typically tested through research and experiments to be supported or refuted.

Z Statistic

The Z statistic, or Z-score, is used in hypothesis testing, measuring the number of standard deviations a datapoint is from the population mean.

P-value

A measure in statistical hypothesis testing representing the probability of obtaining a result at least as extreme as the one observed, under the assumption that the null hypothesis is true.

Confidence Interval

A set of numbers obtained from statistical data from a sample, which is expected to encompass the value of a parameter from the overall population that is not known.