v******2
发帖数: 9 | 1 From past experience, the cognition scores on a certain test are known to
have a mean of
60 and s = 12. You have tested a random sample of 40 subjects who have a
history of
depression and found a sample mean of 58.
a. Is there significant evidence that the mean score in this population
differs from 60?
Use a=5% and assume that the standard deviation is still 12. In your
conclusion,
identify the relevant population.
b. Is it necessary to assume the data come from a normal distribution? Why
or why not?
如题，关于b问不太了解，求前辈指教，本人菜鸟！谢过~ | x***x
发帖数: 3401 | |
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