MATLAB: A Practical Introduction to Programming and Problem Solving
5th Edition
ISBN: 9780128154793
Author: Stormy Attaway Ph.D. Boston University
Publisher: Elsevier Science
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Chapter 7, Problem 9E
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A school administrator wants to see if there is a difference in the number of students per class for the
Portland Public School district (Group 1) compared to the Beaverton School district (Group 2).
Let μ be the average number of students per class for the Portland Public School district.
Let 2 be the average number of students per class for the Beaverton School district. Assume the
populations are normally distributed.
A random sample of 25 Portland classes found a mean of 36 students per class with a standard deviation of
6.
A random sample of 27 Beaverton classes found a mean of 38 students per class with a standard deviation
of 5.
a. Find a 91% confidence interval for the difference of the means. Use Excel Two Means Calculator
found in the Course and round answers to 2 decimal places.
<1-2
b. Select the correct conclusion based on the above confidence interval.
O Since the above confidence interval contains zero, with 91% confident, it is plausible that the
average number of…
Show all working as to how the answer was derived.
1. Currently, bank employees in the United States On less than $2,000/month. How would you
set up a hypothesis test to corroborate this statement based on a given sample and confidence
level?
A. Ho:
<2000
B. Ho: ≤2000
c. H₁: <2000
D. H₁: ≤2000
Assuming that the number of customer complaints follows a normal distribution, test the
hypothesis that the average number of complaints is higher in the Mexican franchise (remember
to first conduct a test for the equality of variances to find the statistic to use in the test of means).
Use a significance level of 5% for your calculations.
A. This is a left-tailed test where the test statistic t = -1.4558 allows us to reject Ho.
B. This is a right-tailed test where the test statistic t = -1.4201 allows us to reject H.
C. This is a left-tailed test where the test statistic t = -1.4558 does not allow us to reject
Ho-
D. This is a left-tailed test where the test statistic t = -1.4201 does not allow…
Show all workings as to how the correct answer' was derived
4. Consider a large population of people from which a sample of 600 is taken and each is
classified according to X = Nivel de educación (no education, primary education, secondary
education, post-secondary education) and Y = Sexo (male or female). Conducting a test on
the independence of the two qualitative variables (unit 5):
5.
6. Based on a past sample of 300 customers, a coffee pod factory found that 75% of its customers
prefer the standard variety of coffee, while 25% prefer decaffeinated. However, it is suspected
that in recent years there has been a change in customer preferences. To analyze whether this
is, in fact, the case, the records of 250 customers who recently made a purchase are taken,
obtaining the following results:
Male
Female
Standard
variety
Decaf
Number of
clients
207
No education
15
30
Primary
education
120
150
Secondary
90
90
education
Post-secondary
education
65
40
A. The null hypothesis is rejected,…
Chapter 7 Solutions
MATLAB: A Practical Introduction to Programming and Problem Solving
Chapter 7, Problem 7.1PChapter 7, Problem 7.2PChapter 7, Problem 7.3PChapter 7, Problem 7.4PChapter 7, Problem 7.5PChapter 7, Problem 7.6PChapter 7, Problem 1EChapter 7, Problem 2EChapter 7, Problem 3EChapter 7, Problem 4E
Chapter 7, Problem 5EChapter 7, Problem 6EChapter 7, Problem 7EChapter 7, Problem 8EChapter 7, Problem 9EChapter 7, Problem 10EChapter 7, Problem 11EChapter 7, Problem 12EChapter 7, Problem 13EChapter 7, Problem 14EChapter 7, Problem 15EChapter 7, Problem 16EChapter 7, Problem 17EChapter 7, Problem 18EChapter 7, Problem 19EChapter 7, Problem 20EChapter 7, Problem 21EChapter 7, Problem 22EChapter 7, Problem 23EChapter 7, Problem 24EChapter 7, Problem 25EChapter 7, Problem 26EChapter 7, Problem 27EChapter 7, Problem 28EChapter 7, Problem 29EChapter 7, Problem 30EChapter 7, Problem 31EChapter 7, Problem 32EChapter 7, Problem 33EChapter 7, Problem 34EChapter 7, Problem 35EChapter 7, Problem 36EChapter 7, Problem 37E
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