Questions Below Will Be Based on the Following: a Researcher

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