Question

Provide an example of the following: (a) A research problem appropriate for a non-directional test using the one-sample z-statistic. (b) A research problem appropriate for a directional test using the one-sample t-statistic.

Answer #1

Non directional single sample Z test : there are 428 green peas and 150 yellow peas , use a 0.05 significance level to test the claim that that the proportion of yellow peas is equal to 1/4

one sample t test :coca-cola company claim that mean volume of soda in there bottle is more than 12 oz. As a researcher you want to check this claim , you took sample of 39 cans of soda and found that mean is 12.11 oz with a sample standard deviation of 0.28 oz. test the coca-cola claim at significance level of 0.01

Provide an example of a paired sample t-test in pharmaceutical
research.

Provide an example of a one sample proportion test in scientific
research.

HW 6: z-test, t-test for independent samples, t-test for related
samples, 1-way ANOVA
Researchers wanted to explore different treatment methods to
effect memory skills in high school freshmen. Subjects were given a
memory test (under multiple conditions) these were the results:
Group 1
10, 8, 9, 11,
8, 9, 7, 6,
9, 8
Group 2
12, 10,
11, 9, 13, 8, 9, 12, 11, 11
Group 3
10, 9, 10, 9, 11,
8, 7, 9, 10, 11...

For the following research question, state an appropriate null
and alternate hypothesis and determine whether the hypothesis test
would be directional or non-directional and whether it would be a
test of difference, equivalence, superiority, or non-inferiority.
Do students who get at least 8 hours of sleep the night before an
exam get different exam grades than those who get less than 8 hours
of sleep

In the following studies, state whether the one-sample
t test is an appropriate test statistic to analyze data.
If not, then explain why it is not appropriate.
(a) a study testing whether night-shift workers sleep the
recommended 8 hours per day
a one-sample t-test is appropriatea OR
one-sample t-test is not appropriate because a specific
standard or criteria is not identified
(b) a study measuring differences in attitudes about morality
among people who self-identify as liberal or conservative
a one-sample...

With respect to the z test (statistic) and the t test
(statistic), each of the following are true, except:
1. When using either the z test or the t test, the sampling
distribution should be positively skewed.
2. The z test is appropriate when the parameters of the
population are known.
3. The t test is appropriate when the parameters of the
population are unknown.
4. When using the z test or the t test depends of if μ and...

1). Conduct the appropriate hypothesis test with the following
information, and provide your p-value as your final
answer. The null hypothesis states that H0:=
250 versus the alternative Ha: > 250. The sample of
size 26 resulted in a mean of 255.0 and a standard deviation of
8.79.
Find the p-value in this example.
2). Conduct the appropriate hypothesis test with the following
information, and provide your p-value as your final
answer. The null hypothesis states that H0: =
0.75 versus the...

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...

What is the main use of a one sample Z-Test? Please provide an
example.

a) Provide a real life example scenario for a paired-samples
t-test that includes sample data for N = 4 in each
condition. Do not only present the numbers; you need a reasonable
example of something that could be tested with a paired-samples
t-test.
b) Explain why your example is appropriate for a paired-samples
t-test.
c) Conduct the paired-samples t-test (two-tailed test
with an alpha of .05), showing your work for each step.

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