Question

The score on the chapter 8 test is compared with a student’s chapter 2 test. If a claim about the scores not being different is tested, - Find the t test statistic. Name A B C D E Ch 8 40 42 50 45 46 Ch 2 40 35 40 42 45 D 0 7 10 3 1 Find the margin of error: Find the 95% confidence interval of the mean difference, . For a 90% confidence interval between the difference of 2 proportions (home runs per at bat), the following data was found: Team Red Sox Giants x, home runs 167 154 n, at bats 3250 3455 What is the critical value, ? What is the confidence interval? Find the test-statistic. Find the p-value of a test-statistics for the difference between two means, paired samples, given a test-statistic of t= 2.015, : > 0, n=19. Test the claim that the proportion of the students taking Math 13 is the same as it was 10 years ago. Today: x= 40, n= 100. 10 years ago: x=50, n= 125. Let α= .05. ᴧ Extra credit: For a pooled estimate, find p-hat, if =12, =18, =20, =28.

Answer #1

Stats Ch 10-11 Test Your Excellency__________________
The score on the chapter 8 test is compared with a student’s
chapter 2 test. If a claim about the scores not being different is
tested, -
Find the t test statistic.
Name
A
B
C
D
E
Ch 8
40
42
50
45
46
Ch 2
40
35
40
42
45
D
0
7
10
3
1
Find the margin of error:
Find the 95% confidence interval of the mean difference, .
For...

When only two treatments are involved, ANOVA and the Student’s
t test (Chapter 11) result in the same conclusions. Also,
for computed test statistics, t2 =
F. To demonstrate this relationship, use the following
example. Fourteen randomly selected students enrolled in a history
course were divided into two groups, one consisting of 6 students
who took the course in the normal lecture format. The other group
of 8 students took the course as a distance course format. At the
end...

The difference(after-before) in the score on a cognitive
function test before and after the drug Adderall was given to 10
test subjects is 4, 5, 10, -5, -1, 12, 3, 15, -6, 9. Test the
claim, at the 1% significance level, that Adderall improved test
scores. Find the 99% confidence interval for the difference in test
scores.

The difference(after-before) in the score on a cognitive
function test before and after the drug Adderall was given to 10
test subjects is 4, 5, 10, -5, -1, 12, 3, 15, -6, 9. Test the
claim, at the 1% significance level, that Adderall improved test
scores.
14. Find the 99% confidence interval for the difference in
test scores in problem #14.

5) A company that manufactures baseball bats believes that its
new bat will allow players to hit the ball for 30 feet farther than
its current model. The owner hires a professional baseball player
known for hitting home runs to hit ten balls with each bat and he
measures the distance each ball is hit to test the company’s claim.
The results of the batting experiment are shown in the following
table. Construct and interpret a 90% confidence interval for...

5) A company that manufactures baseball bats believes that its
new bat will allow players to hit the ball for 30 feet farther than
its current model. The owner hires a professional baseball player
known for hitting home runs to hit ten balls with each bat and he
measures the distance each ball is hit to test the company’s claim.
The results of the batting experiment are shown in the following
table. Construct and interpret a 90% confidence interval for...

5) A company that manufactures baseball bats believes that its
new bat will allow players to hit the ball for 30 feet farther than
its current model. The owner hires a professional baseball player
known for hitting home runs to hit ten balls with each bat and he
measures the distance each ball is hit to test the company’s claim.
The results of the batting experiment are shown in the following
table. Construct and interpret a 90% confidence interval for...

Rhino viruses typically cause common colds. In a test of the
effectiveness of echinacea, 40 of the 45 subjects treated with
echinacea developed rhinovirus infections. In a placebo group,
82
of the 98 subjects developed rhinovirus infections. Use a 0.01
significance level to test the claim that echinacea has an effect
on rhinovirus infections. Complete parts (a) through (c)
below.
a) find test statistic
b) find the p-value
c) construct a confidence interval

In what follows use any of the following tests/procedures:
Regression, confidence intervals, one-sided t-test, or two-sided
t-test. All the procedures should be done with 5% P-value or 95%
confidence interval.
Use the same MathCreditsSalary data.
SETUP: Is it reasonable to claim that people who
took more than 10 math credits will have average salary of 41000 or
more?
5. What test/procedure did you perform?
a. One-sided t-test
b. Two-sided t-test
c. Regression
d. Confidence interval
6. What is the P-value/margin...

Answer number 2 please.
1. Records
of 40 used passenger cars and 40 used pickup trucks were randomly
selected to investigate the
difference in
how long the owners kept their vehicles. For cars, the mean was 5.3
years with standard deviation 2.2
years. For
pickup trucks, the mean was 7.1 years with standard deviation 3.0
years. Find a 95% confidence interval
for the
true difference in means. Add a sentence. (Note that these are all
sample results.) (5)
2. Using
the information in Problem One,...

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