Question

An investigator thinks that people under the age of forty have vocabularies that are different than those of people over sixty years of age. The investigator administers a vocabulary test to a group of 31 younger subjects and to a group of 31 older subjects. Higher scores reflect better performance. The mean score for younger subjects was 14.0 and the standard deviation of younger subject's scores was 5.0. The mean score for older subjects was 20.0 and the standard deviation of older subject's scores was 6.0. Does this experiment provide evidence for the investigator's theory? Are these results meaningful? A. Please state both the null and alternative hypotheses. B. Select a significance level C. Please show all calculations needed to generate the appropriate statistic. D. State your decision as to whether the investigator should reject the null hypothesis. E. Calculate the effect size for each problem.

          An investigator thinks that people under the age of forty have
vocabularies that are different than those of people over sixty
years of age. The investigator administers a vocabulary test to a
group of 31 younger subjects and to a group of 31 older subjects.
Higher scores reflect better performance. The mean score for
younger subjects was 14.0 and the standard deviation of younger
subject's scores was 5.0. The mean score for older subjects was
20.0 and the standard deviation of older subject's scores was 6.0.
Does this experiment provide evidence for the investigator's
theory? Are these results meaningful? 
A. Please state both the null and alternative hypotheses.
B. Select a significance level
C. Please show all calculations needed to generate the appropriate
statistic.
D. State your decision as to whether the investigator should reject
the null hypothesis.
E. Calculate the effect size for each problem.

Added by Katherine C.

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