Question

A researcher did a one-tailed hypothesis test using an alpha level of .01, H0 was rejected.A colleague analyzed the same data but used a two-tailed test with α=.05, H0 was failed to reject. Can both analyses be correct? Explain your answer.

Answer #1

H0 is rejected => P-value<0.01

Note that,

P-value<0.01<0.05

So, H0 should be rejected at 5% also.

So, both analyses cannot be correct .

A researcher conducted a single-sample null hypothesis test with
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z-statistic was calculated from sample data that was drawn from a
normal population. The researcher sets α = .05 and uses a
two-tailed test. On the basis of his data, the researcher decides
to fail to reject the null hypothesis. Did the researcher make the
correct decision or did he make an error? If he made an error, what
type of...

1.- A researcher obtains t = 2.25 for a
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a.
Reject the null hypothesis with α = .05 but not with
α = .01
b.
Reject the null hypothesis with both α = .05 and
α = .01
c.
Fail to reject the null hypothesis with both α = .05
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d.
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Question #3
A researcher is conducting and experiment to evaluate a
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A. z > 2.33
B. z > 2.58
C. z < 2.33
D. z < 2.58
Question #4
A researcher evaluates a treatment effect using a two tailed
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Perform a hypothesis test for the mean for the following sample.
The significance level alpha is 5%.
Sample: 7.9, 8.3, 8.4, 9.6, 7.7, 8.1, 6.8, 7.5, 8.6, 8, 7.8,
7.4, 8.4, 8.9, 8.5, 9.4, 6.9, 7.7.
Test if mean≠8.7.
Assume normality of the data.
1 Formulate the hypothesis by entering the corresponding signs:
"<", ">", "=" or "≠" and numbers. Hint: in your
answers use "<>" instead of "≠".
H0: mean
H1:mean
2 p-value (rounded to three decimal places):
3...

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tests of the mean.
For a two-tailed hypothesis test with level of significance
α and null hypothesis H0: μ =
k, we reject H0 whenever
k falls outside the c = 1 – α
confidence...

Is there a relationship between confidence intervals and
two-tailed hypothesis tests? Let c be the level of
confidence used to construct a confidence interval from sample
data. Let α be the level of significance for a two-tailed
hypothesis test. The following statement applies to hypothesis
tests of the mean.
For a two-tailed hypothesis test with level of significance
α and null hypothesis H0: μ =
k, we reject H0 whenever
k falls outside the c = 1 − α
confidence...

Is there a relationship between confidence intervals and
two-tailed hypothesis tests? Let c be the level of
confidence used to construct a confidence interval from sample
data. Let α be the level of significance for a two-tailed
hypothesis test. The following statement applies to hypothesis
tests of the mean.
For a two-tailed hypothesis test with level of significance
α and null hypothesis H0: μ =
k, we reject H0 whenever
k falls outside the c = 1
– α confidence interval...

#1.
a. You do a hypothesis test and reject the null hypothesis at
the α = .05 level. What can you say about p? Hint: Your answer
should be an inequality.
b.Can you tell from this information whether you would reject at
the α = .10 level? Explain.
c. Can you tell from this information whether you would reject
at the α = .01 level? Explain.
#2
a You do a hypothesis test and fail to reject the null
hypothesis...

Consider the hypothesis test H0: = against H0: > . Suppose
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Refer the question above test the hypothesis and provide your
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At the alpha = 0.01, we fail to reject and conclude that the
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At...

If one is making a two-tailed test and the value of the z test
statistic is -11.12, a correct conclusion from this is
Group of answer choices:
do not reject HO
a type II error has been made.
reject HO
reject HO at the .05 level but not at the .01 level.

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