Path To College Mathematics, Books A La Carte Edition Plus Mylab Math Student Access Kit
1st Edition
ISBN: 9780134618555
Author: Elayn Martin-Gay
Publisher: PEARSON
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Chapter B, Problem 48ES
Use diagrams and deductive reasoning to solve each problem. See Example 6.
In a poll of
people, the following information was gathered.
people listen to rock-n-roll music.
How many people listen to country music only?
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2. Hypothesis Testing - Two Sample Means
A nutritionist is investigating the effect of two different diet programs, A and B, on weight loss. Two
independent samples of adults were randomly assigned to each diet for 12 weeks. The weight losses (in kg)
are normally distributed.
Sample A: n = 35, 4.8, s = 1.2
Sample B: n=40, 4.3, 8 = 1.0
Questions:
a) State the null and alternative hypotheses to test whether there is a significant difference in mean weight
loss between the two diet programs.
b) Perform a hypothesis test at the 5% significance level and interpret the result.
c) Compute a 95% confidence interval for the difference in means and interpret it.
d) Discuss assumptions of this test and explain how violations of these assumptions could impact the results.
1. Sampling Distribution and the Central Limit Theorem
A company produces batteries with a mean lifetime of 300 hours and a standard deviation of 50 hours. The lifetimes are not normally distributed—they are right-skewed due to some batteries lasting unusually long.
Suppose a quality control analyst selects a random sample of 64 batteries from a large production batch.
Questions:
a) Explain whether the distribution of sample means will be approximately normal. Justify your answer using the Central Limit Theorem.
b) Compute the mean and standard deviation of the sampling distribution of the sample mean.
c) What is the probability that the sample mean lifetime of the 64 batteries exceeds 310 hours?
d) Discuss how the sample size affects the shape and variability of the sampling distribution.
An airplane flies due west at an airspeed of 428 mph. The wind blows in the direction of 41° south of west
at 50 mph. What is the ground speed of the airplane? What is the bearing of the airplane?
428 mph
41°
50 mph
a. The ground speed of the airplane is
b. The bearing of the airplane is
mph.
south of west.
Chapter B Solutions
Path To College Mathematics, Books A La Carte Edition Plus Mylab Math Student Access Kit
Ch. B - Determine whether each is an example of inductive...Ch. B - Prob. 2ESCh. B - Prob. 3ESCh. B - Prob. 4ESCh. B - Prob. 5ESCh. B - Prob. 6ESCh. B - Prob. 7ESCh. B - Prob. 8ESCh. B - Prob. 9ESCh. B - Prob. 10ES
Ch. B - Prob. 11ESCh. B - Prob. 12ESCh. B - Prob. 13ESCh. B - Prob. 14ESCh. B - Prob. 15ESCh. B - Prob. 16ESCh. B - Prob. 17ESCh. B - Prob. 18ESCh. B - Prob. 19ESCh. B - Prob. 20ESCh. B - Prob. 21ESCh. B - Prob. 22ESCh. B - Prob. 23ESCh. B - Prob. 24ESCh. B - Prob. 25ESCh. B - Prob. 26ESCh. B - Prob. 27ESCh. B - Prob. 28ESCh. B - Prob. 29ESCh. B - Prob. 30ESCh. B - Prob. 31ESCh. B - Prob. 32ESCh. B - Prob. 33ESCh. B - Prob. 34ESCh. B - Prob. 35ESCh. B - Give an example occurring outside the classroom...Ch. B - Prob. 37ESCh. B - Prob. 38ESCh. B - Prob. 39ESCh. B - Prob. 40ESCh. B - Prob. 41ESCh. B - Prob. 42ESCh. B - Prob. 43ESCh. B - Prob. 44ESCh. B - Prob. 45ESCh. B - Prob. 46ESCh. B - Prob. 47ESCh. B - Use diagrams and deductive reasoning to solve each...Ch. B - Prob. 49ESCh. B - Prob. 50ESCh. B - Prob. 51ESCh. B - Prob. 52ESCh. B - Prob. 53ESCh. B - Prob. 54ES
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