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Annotate this when testing a new headache treatment vs placebo in a sample of 100 individuals, do the observed differences in the sample provide high con- fidence that the treatment will also work in the popula- tion?
a) Because samples contain random sampling error
b) researchers require a set of methods to help decide if any observed treatment difference
c) observed rela- tionship
d) is simply due to chance

Sagot :

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