Excursions in Modern Mathematics (9th Edition)
9th Edition
ISBN: 9780134468372
Author: Peter Tannenbaum
Publisher: PEARSON
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Chapter 10, Problem 15E
Over a period of one week, the Dow Jones Industrial Average (DJIA) did the following: On Monday the DJIA went up by 2.5%, on Tuesday it went up by 12.1%, on Wednesday it went down by 4.7%, on Thursday it went up by 0.8%, and on Friday it went down by 5.4%. What was the percentage increase/decrease of the DJIA over the week? Round your answer to the nearest tenth of a percentage point.
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Let us suppose we have some article reported on a study of potential sources of injury to equine veterinarians conducted at a
university veterinary hospital. Forces on the hand were measured for several common activities that veterinarians engage in when
examining or treating horses. We will consider the forces on the hands for two tasks, lifting and using ultrasound. Assume that both
sample sizes are 6, the sample mean force for lifting was 6.2 pounds with standard deviation 1.5 pounds, and the sample mean force
for using ultrasound was 6.4 pounds with standard deviation 0.3 pounds. Assume that the standard deviations are known.
Suppose that you wanted to detect a true difference in mean force of 0.25 pounds on the hands for these two activities. Under the null
hypothesis, 40 = 0. What level of type II error would you recommend here?
Round your answer to four decimal places (e.g. 98.7654). Use a
= 0.05.
β
= i
What sample size would be required?
Assume the sample sizes are to be equal.…
=
Consider the hypothesis test Ho: μ₁ = μ₂ against H₁ μ₁ μ2. Suppose that sample sizes are n₁ =
15 and n₂ =
15, that x1 = 4.7
and X2 = 7.8 and that s² = 4 and s² = 6.26. Assume that o and that the data are drawn from normal distributions. Use
απ 0.05.
(a) Test the hypothesis and find the P-value.
(b) What is the power of the test in part (a) for a true difference in means of 3?
(c) Assuming equal sample sizes, what sample size should be used to obtain ẞ = 0.05 if the true difference in means is - 2? Assume
that α = 0.05.
(a) The null hypothesis is
98.7654).
rejected. The P-value is 0.0008
(b) The power is 0.94
. Round your answer to four decimal places (e.g.
Round your answer to two decimal places (e.g. 98.76).
(c) n₁ = n2 =
1
. Round your answer to the nearest integer.
Consider the hypothesis test Ho:
=
622 against H₁: 6 > 62. Suppose that the sample sizes are n₁ =
20 and n₂ =
8, and that
=
4.5; s=2.3. Use a = 0.01.
(a) Test the hypothesis.
Round your answers to two decimal places (e.g. 98.76).
The test statistic is fo
=
i
The critical value is f =
Conclusion:
i
the null hypothesis at a = 0.01.
(b) Construct the confidence interval on 02/022 which can be used to test the hypothesis:
(Round your answer to two decimal places (e.g. 98.76).)
i
Chapter 10 Solutions
Excursions in Modern Mathematics (9th Edition)
Ch. 10 - Express each of the following percentages as a...Ch. 10 - Express each of the following percentages as a...Ch. 10 - Express each of the following percentages as a...Ch. 10 - Express each of the following percentages as a...Ch. 10 - Suppose that your lab scores in a biology class...Ch. 10 - There were four different sections of Financial...Ch. 10 - A 250-piece puzzle is missing 14 of its pieces...Ch. 10 - Jefferson Elementary School has 750 students. The...Ch. 10 - At the Happyville Mall, you buy a pair of earrings...Ch. 10 - Arvins tuition bill for last semester was 5760. If...
Ch. 10 - For three consecutive years the tuition at...Ch. 10 - For three consecutive years the cost of gasoline...Ch. 10 - A shoe store marks up the price of its shoes at...Ch. 10 - Prob. 14ECh. 10 - Over a period of one week, the Dow Jones...Ch. 10 - Over a period of one week, the Dow Jones...Ch. 10 - Suppose you borrow 875 for a term of four years at...Ch. 10 - Suppose you borrow 1250 for a term of three years...Ch. 10 - Suppose you purchase a four-year bond with an APR...Ch. 10 - Suppose you purchase a 15-year U.S. savings bond...Ch. 10 - Suppose you purchase an eight-year bond for 5400....Ch. 10 - Suppose you purchase a six-year muni bond for...Ch. 10 - Find the APR of a bond that doubles its value in...Ch. 10 - Find the APR of a bond that doubles its value in...Ch. 10 - Prob. 25ECh. 10 - Prob. 26ECh. 10 - For all answers involving money, round the answer...Ch. 10 - For all answers involving money, round the answer...Ch. 10 - For all answers involving money, round the answer...Ch. 10 - For all answers involving money, round the answer...Ch. 10 - For all answers involving money, round the answer...Ch. 10 - For all answers involving money, round the answer...Ch. 10 - For all answers involving money, round the answer...Ch. 10 - For all answers involving money, round the answer...Ch. 10 - For all answers involving money, round the answer...Ch. 10 - For all answers involving money, round the answer...Ch. 10 - Prob. 37ECh. 10 - Prob. 38ECh. 10 - Prob. 39ECh. 10 - Prob. 40ECh. 10 - For all answers involving money, round the answer...Ch. 10 - For all answers involving money, round the answer...Ch. 10 - For all answers involving money, round the answer...Ch. 10 - For all answers involving money, round the answer...Ch. 10 - Find the value of a retirement savings account...Ch. 10 - Find the value of a retirement savings account...Ch. 10 - Find the value of a retirement savings account...Ch. 10 - Find the value of a retirement savings account...Ch. 10 - Find the value of a retirement savings account...Ch. 10 - Find the value of a retirement savings account...Ch. 10 - Find the value of a retirement savings account...Ch. 10 - Find the value of a retirement savings account...Ch. 10 - What should your monthly contribution be if your...Ch. 10 - Prob. 54ECh. 10 - Consider a retirement savings account where the...Ch. 10 - Consider a retirement savings account where the...Ch. 10 - Suppose you purchase a car and you are going to...Ch. 10 - Suppose you purchase a car and you are going to...Ch. 10 - Suppose you want to buy a car. The dealer offers a...Ch. 10 - Suppose you want to buy a car. The dealer offers a...Ch. 10 - The Simpsons are planning to purchase a new home....Ch. 10 - The Smiths are refinancing their home mortgage to...Ch. 10 - Ken just bought a house. He made a 25,000 down...Ch. 10 - Cari just bought a house. She made a 35,000 down...Ch. 10 - Elizabeth went on a fabulous vacation in May and...Ch. 10 - Reids credit card cycle ends on the twenty-fifth...Ch. 10 - Prob. 67ECh. 10 - Joe, a math major, calculates that in the last...Ch. 10 - You have a coupon worth x off any item including...Ch. 10 - Prob. 70ECh. 10 - You are purchasing a home for 120,000 and are...Ch. 10 - Prob. 72ECh. 10 - Prob. 73ECh. 10 - Prob. 74ECh. 10 - Linear relationship between V and P in the...Ch. 10 - Linear relationship between P and M in the...
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