A researcher administers a treatment to a sample of particip

A researcher administers a treatment to a sample of participants selected from a population with

Solution

with a much different sample mean , the value of test static increases

as

test static = sample mean - u/s/sqrt(n)

which gives a lower p-value

null hypothesis can be rejected if p-value is less than a

as \'a\' level of significance increases , the rejection area increases

so the answer is

A sample mean much different than 80 with a = .01