Question

We like to test that mean income of town A is higher than that
of town B with 0.05 alpha. To test, we collect 15 data from each
town. Which one is the correct one? Choose all applied.

A. We need to do Two Shapiro tests first and if both conclusions
are not "reject H0", then do Wilcoxon rank sum test with medians to
compare.

B. We need to do Two Shapiro tests first and if both conclusions
are "Do not reject H0", then do pooled t test if population
variances of incomes of two towns are equal.

C. We need to do Two Shapiro tests first and if both conclusions
are "Do not reject H0", then do separated t test if population
variances of incomes of two towns are equal.

D. We need to do Two Shapiro tests first and if both conclusions
are not "reject H0", then do Wilcoxon rank sum test with means to
compare.

Answer #1

We like to test that mean income of town A is higher than that
of town B with 0.05 alpha. To test, we collect 15 data from each
town. Which one is the correct one? Choose all applied.
a. We need to do Two Shapiro tests first and if both conclusions
are not "reject H0", then do Wilcoxon rank sum test with medians to
compare.
b. We need to do Two Shapiro tests first and if both conclusions
are "Do...

14. The Wilcoxon Signed Rank test is used _________
(A)
Only with independent samples
(B)
Only in matched pairs samples (dependent samples)
(C)
To test for randomness
(D)
As an alternative to the Kruskal-Wallis test
15. Which of the following test must be two-sided?
(A)
Wilcoxon Signed Rank
(B)
Kruskal-Wallis
(C)
Runs test
(D)
Sign test
16. In testing for the difference between two populations, it is
possible to use _________
(A)
The Wilcoxon Rank-Sum test
(B)
The Sign test...

True or False?
A) You do a hypothesis test on 2 means, if you reject H0 at the
significance level of 10%, then you will reject H0 at the
significance level of 5%. T or F?
B) If the variances of 2 normal populations are unknown but
assumed to be unequal, the appropriate statistic to compare the 2
means is the t of student (we assume here a small sample) . T or
F?
C) If the variances of 2...

A craft brewer sells beer in 2 nearby towns. Some months, he
sells more in Town 1 & other months hesells more in Town 2.
However, he is pretty sure that he usually sells more in Town 1.
So, he has set up the following hypothesis test. He has also looked
up the sales figures from the last 30 months in both towns and
calculated some sample statistics. Those are below too. Use this
information to answer/do the following.
H0...

Consider the computer output below.
Two-Sample T-Test and CI
Sample
N
Mean
StDev
SE Mean
1
15
54.79
2.13
0.55
2
20
58.60
5.28
1.2
Difference = μ1-μ2
Estimate for difference: –3.91
95% upper bound for difference: ?
T-test of difference = 0 (vs <): T-value = -2.93
P-value = ?
DF = ?
(a) Fill in the missing values. Use lower and upper bounds for
the P-value. Suppose that the hypotheses are H0: μ1-μ2=0 versus H1:
μ1-μ2<0.
Enter your...

3. Suppose that we want to test for the difference between two
population variances. Explain which test we would use. Compare this
test with tests for the difference in two population means.
Plz type answer and try to write a page

Suppose that we want to test the null hypothesis that the mean
of population 1 is equal to the mean of population 2. We select a
random sample from population 1 and a random sample from population
2, and these two samples are independent. Circle the FALSE
statement.
A. We need to perform a two-sided test.
B. If we know the variance of each population, even if they are
different, we can use the Z test. That is, the test...

5. A researcher is conducting a study on the palliative care of
patients at a specific facility to determine how their chronic pain
symptoms change after entering the palliative care environment.
This study is aimed at determining the effectiveness of a
standardized treatment protocol for the patients entering into the
palliative care environment. To do this, the researcher is
comparing the pain scores of individuals before treatment and after
treatment. Set up a Wilcoxon signed-ranks test and interpret it at...

To perform a test of the null and alternative hypotheses shown
below, random samples were selected from the two normally
distributed populations with equal variances. The data are shown
below. Test the null hypothesis using an alpha level equal to
0.10.
Sample from Population 1: 38,28,28,39,39,33,29,37,43,38
Sample from Population 2: 45,53,37,47,44,38,43,46,46,41
H0: ?1 ? ?2 = 0
HA: ?1 – ? ? 0
Determine the rejection region for the test statistic t. Select
the correct choice below and fill in...

Suppose we test the proportions of people who like having a cup
of coffee early in the morning for two populations: H0:
p1= p2 vs Ha: p1 <
p2. The sample sizes for these two population are
n1 = n2 = 400 and the numbers of people
who like coffee are x1 = 160 and x2 = 200
respectively.
1) What is the value of the test statistic?
a. -2.8571
b. -2.8427
c. -2.8866
d. -2.828
2) Suppose we take...

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