A researcher evaluates a new growth hormone. One sample of rats is raised with the hormone in their diet and a second sample is raised without the hormone. After 6 months, the researcher weighs each rat to determine whether the rats in one group are significantly larger than the rats in the other group. A second researcher measures femininity for each individual in a group of 10-year-old girls who are all daughters of mothers who work outside of the home. These scores are then compared with corresponding measurements obtained from girls who are all daughters of mothers who work at home. The researcher hopes to show that one group is significantly more feminine than the other. Explain why the first researcher is probably not concerned about the validity of the measurement, whereas the second researcher probably is. (Hint: What variable is each researcher measuring and how will it be measured?)

MATLAB: An Introduction with Applications
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A researcher evaluates a new growth hormone. One sample of rats is raised with the hormone in their diet and a second sample is raised without the hormone. After 6 months, the researcher weighs each rat to determine whether the rats in one group are significantly larger than the rats in the other group. A second researcher measures femininity for each individual in a group of 10-year-old girls who are all daughters of mothers who work outside of the home. These scores are then compared with corresponding measurements obtained from girls who are all daughters of mothers who work at home. The researcher hopes to show that one group is significantly more feminine than the other. Explain why the first researcher is probably not concerned about the validity of the measurement, whereas the second researcher probably is. (Hint: What variable is each researcher measuring and how will it be measured?)

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