Question

a researcher conducts a hypothesis test to evaluate the effect of the treatment that is expected to increases scores. the hypothesis test produces a z-score of z= 2.75. if the researcher is using a one tailed test, what is the correct statistical decision?

Answer #1

this is a righ tailed test (one tailed)

tset statistc (z) = 2.75

p value is:-

[ using standrad normal table]

p value = 0.003 <0.05 (alpha)

so, we * reject the null hypothesis* and
conclude that there is sufficient evidence to claim that the
treatment is expected to increases scores.

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a researcher conducts a hypothesis test to evaluate the effect
of the treatment. the hypothesis test produces a z-score of z=
2.75. Assuming that the researcher is using a two-tailed test,what
decision should be made?

Question #3
A researcher is conducting and experiment to evaluate a
treatment that is expected to increase the scores for individuals
in a population. If the researcher uses a one-tailed test with ( a
= .01), then which of the following correctly identifies the
critical region?
A. z > 2.33
B. z > 2.58
C. z < 2.33
D. z < 2.58
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