questions please help me with this with correct answer pleas

questions

please help me with this with correct answer please thanks ..

Solution

1.

As the test statistic is given by

t = X / (s/sqrt(n))

As we can see, the test statistic varies inversely with the standard deviation.

As it is more likely to reject Ho is t is higher, then we want a smaller standard deviation.

Thus, it is STUDY 2. [ANSWER, STUDY 2]

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