Questions Below Will Be Based on the Following: a Researcher

question 87

Multiple Choice

Questions below will be based on the following: A researcher wishes to test the hypothesis that intelligence is a sex-linked characteristic. A random sample of 1000 women is selected and given IQ tests. Similarly, a random sample of 1000 men is selected and also given IQ tests. The mean IQ's of the two groups are compared and the difference is found to be significantly in favor of the females.
-When the experimental method has been used, and a significant difference is established between the means of two sample groups, then it is highly probable that

• A) the sample groups could not have been equivalent to start with
• B) the sample groups now represent different populations
• C) the sample groups still represent a single population
• D) the population parameters are known

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Definitions:

P-Value

The probability of obtaining test results at least as extreme as the ones observed during the test, assuming the null hypothesis is true.

Capital Punishment

A legal penalty in some jurisdictions where the state executes a person as a punishment for a crime.

Uniformly Distributed

A distribution where all outcomes are equally likely to occur, each observation within a certain range has the same probability.

Null Hypothesis

The assumption in statistical testing that there is no significant difference or effect and that any observed difference is due to chance.