Question

Since obtaining statistical significance is easier to obtain with a directional hypothesis (one-tailed test) than with a non-directional hypothesis (two-tailed test), why would anyone ever design a study with a nondirectional hypothesis?

Answer #1

Since obtaining statistical significance is easier to obtain
with a directional hypothesis (one-tailed test) than with a
non-directional hypothesis (two-tailed test), why would anyone ever
design a study with a nondirectional hypothesis?

Directional versus nondirectional hypothesis testing. Cho and
Abe (2013) provided a commentary on the appropriate use of
one-tailed and two-tailed tests in behavioral research. In their
discussion, they outlined the following hypothetical null and
alternative hypotheses to test a research hypothesis that males
self-disclose more than females:
H0: µmales − µfemales ≤ 0
H1: µmales − µfemales > 0
What type of test is set up with these hypotheses, a
directional test or a nondirectional test?
Do these hypotheses encompass...

In which case would testing the null hypothesis involve a
two-tailed statistical test?

When would you use a one-tailed rather than a two-tailed t-test
when checking significance levels?

1.) One tailed test or two tailed test?
You are performing a hypothesis test for the mean sample weight
of your fellow Intro to Statistics students. For your null
hypothesis , the hypothesized mean weight for the entire campus
student body is 165. You have no reason to know for your
alternative hypothesis whether the actual mean weight for the
entire student campus body is more or less than 165. So you decide
to make your alternative hypothesis as not...

What is the difference between a one-tailed test and a
two-tailed test?
Multiple Choice
In a one-tailed test, the rejection region is in one of the
tails, whereas in a two-tailed test the area of rejection is
“split” between both tails of the distribution.
In a one-tailed test, the rejection region is always in the
upper tail, whereas in a two-tailed test the area of rejection is
“split” between both tails of the distribution.
In a one-tailed test, the p-value...

In a two-tailed hypothesis test of the mean using a 0.05 level
of significance, researchers calculated a p-value of 0.03. What
conclusion can be drawn? The alternative hypothesis should be
rejected because the p-value is so small. The null hypothesis is
true because the p-value is less than the level of significance.
The alternative hypothesis is 3% likely to be true. The null
hypothesis should be rejected because the p-value is less than the
level of significance.
1.The alternative hypothesis...

A researcher wishes to study the effect of cognitive behavior
therapy on young people diagnosed with depression. Consider and
discuss the following questions as you respond:
Would you recommend using a z test, a t test,
or an ANOVA for the analysis?
Explain your answer.
What would your choice of test depend on? For the test you
select, explain your design and your comparison groups.
Would the hypothesis be directional or nondirectional?
Would the test be one or two tailed?...

1) indicate the most appropriate statistical test 2) an
assumption 3) weather the test is directional or non-directional
(one tailed vs two tailed)
A. to determine if the average Math score at NYU is higher than
90
B. to determine whether seniors, juniors, sophomores, and
freshmen differ in their attitudes (continuous) toward mandatory
sexual education
C. to examine whether there is a relationship between final
statistics scores and the number of time class was attended. 500
nurses were tested.
D....

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