Question

What is the F-critical value for a one-tail F-test if the
numerator sample size is 21 (n_{1}) and the denominator
sample size is 16 (n_{2}); use level of significance (α)
0.05.

Select one:

a. 3.37

b. -3.99

c. 2.33

d. 3

To test the effectiveness of a business school preparation course, 8 students took a general business test before and after the course. The results are given below.

Exam Score Exam Score

Student Before Course (1) After Course (2)

1 530 670

2 690 770

3 910 1,000

4 700 710

5 450 550

6 820 870

7 820 770

8 630 610

Referring to above table, the value of the sample *mean*
*difference* is ________ if the *difference* scores
for each student reflect the results of the exam *Before
Course* minus the results of the exam *After
Course*.

Select one:

a. 400

b. -50

c. 0

d. 50

For a paired t-test with 28 samples, the degrees of freedom are--

Select one:

a. *20*

b. *14*

c. *27*

d. *25*

When testing *H*_{0}: π_{1} -
π_{2} = 0 versus *H*_{1}: π_{1} -
π_{2} > 0, the observed value of the *Z* test
statistic was found to be 1.57. The *p*-value for this test
is

Select one:

a. 0.1164

b. 0.9418.

c. 0.0332

d. 0.0582

Suppose, in testing a hypothesis about a mean, the
*p-*value is computed to be 0.005. The null hypothesis
should be rejected if the chosen level of significance (α) is
0.01.

Select one:

True

False

Answer #1

What is the F-critical value for a one-tail F-test if the
numerator sample size is 21 (n_{1}) and the denominator
sample size is 16 (n_{2}); use level of significance (α)
0.05.

c. 2.33

Referring to above table, the value of the sample *mean*
*difference* is ________ if the *difference* scores
for each student reflect the results of the exam *Before
Course* minus the results of the exam *After
Course*.

b. -50

For a paired t-test with 28 samples, the degrees of freedom are--

c. *27*

When testing *H*_{0}: π_{1} -
π_{2} = 0 versus *H*_{1}: π_{1} -
π_{2} > 0, the observed value of the *Z* test
statistic was found to be 1.57. The *p*-value for this test
is

d. 0.0582

Suppose, in testing a hypothesis about a mean, the
*p-*value is computed to be 0.005. The null hypothesis
should be rejected if the chosen level of significance (α) is
0.01.

True

In order to determine whether or not a driver’s
education course improves the scores on a driving test, a sample of
6 students were given the test before and after taking the course.
The results are shown below.
Let d = Score after – Score before.
Student
Before the
Course
After the Course
1
83
87
2
89
88
3
93
91
4
77
77
5
86
93
6
79
83
Use α = 0.1 and test to see if...

Test scores on a Spanish language proficiency exam given to
entering first year students at a certain university have a mean
score of 78 with a standard deviation of 9 points (out of 100
points possible). Question 3 Subquestions 3.a 1 point(s) Suppose a
first year student who took this Spanish proficiency exam is
selected at random. What can be said about the probability that
their score will be at least 80 points? 0.5871 0.0582 0.4129 0.9418
It cannot be...

An SAT prep course claims to improve the test score of students.
The table below shows the scores for seven students the first two
times they took the verbal SAT. Before taking the SAT for the
second time, each student took a course to try to improve his or
her verbal SAT scores. Do these results support the claim that the
SAT prep course improves the students' verbal SAT scores? Let
d=(verbal SAT scores prior to taking the prep course)−(verbal...

An SAT prep course claims to improve the test score of students.
The table below shows the scores for seven students the first two
times they took the verbal SAT. Before taking the SAT for the
second time, each student took a course to try to improve his or
her verbal SAT scores. Do these results support the claim that the
SAT prep course improves the students' verbal SAT scores?
Let d=(verbal SAT scores prior to taking the prep
course)−(verbal...

An SAT prep course claims to improve the test score of students.
The table below shows the scores for seven students the first two
times they took the verbal SAT. Before taking the SAT for the
second time, each student took a course to try to improve his or
her verbal SAT scores. Do these results support the claim that the
SAT prep course improves the students' verbal SAT scores? Let
d=(verbal SAT scores prior to taking the prep course)−(verbal...

9. An SAT prep course claims to improve the test score of
students. The table below shows the scores for seven students the
first two times they took the verbal SAT. Before taking the SAT for
the second time, each student took a course to try to improve his
or her verbal SAT scores. Do these results support the claim that
the SAT prep course improves the students' verbal SAT scores? Let
d=(verbal SAT scores prior to taking the prep...

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