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Psy 315 Chapter#4 - 14

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14. Based on the information given for each of the following studies, decide
whether to reject the null hypothesis. For each, give (a) the Z-score cutoff (or
cutoffs) on the comparison distribution at which the null hypothesis should be
rejected, (b) the Z score on the comparison distribution for the sample score, and
(c) your conclusion. Assume that all populations are normally distributed.
A:
z–score = (7 – 5)/1 = 2
At .05 significance level for a one-tailed test, the z-score value = +1.645
Since 2 > 1.645, we will reject the null hypothesis.
B:
z–score = (7 – 5)/1 = 2
At .05 significance level for two-tailed test, the z-score value = ±1.96
Since 2 > +1.96, we will reject the null hypothesis.
C:
z –score = (7 – 5)/1 = 2
At .01 significance level for a one-tailed test, the z-score value = +2.33
Since 2 < 2.33, we fail to reject the null hypothesis.
D:
z –score = (7 – 5)/1 = 2
At .01 significance level for a two-tailed test, the z-score value = ±2.58
Since -2.58 <2< 2.58, we fail to reject the null hypothesis.

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14. Based on the information given for each of the following studies, decide whether to reject the null hypothesis. For each, give (a) the Z-score cutoff (or cutoffs) on the comparison distribution at which the null hypothesis should be rejected, (b) the Z score on the comparison distribution for th ...
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