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 9, Problem 31E
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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,…
A group of 13 healthy children and adolescents participated in a phycological study designed to
analyze the relationship between age and average total sleep time (ATST). To obtain a measure for
ATST (in minutes), recordings were taken on each subject on three consecutive nights and then
averaged. Results are provided to you in Sleep&Age.xlsx ✓ file.
1. (2 points) Determine the least-squares regression line for predicting average total sleep time using
age.
2. (2 points) Make a scatter plot of the data with ATST on the y-axis (vertical axis) and Age on the x-
axis (horizontal axis) with least squares regression line overlaid on the top (i.e.: obtain the fitted line
plot). Make sure to attach the plot below.
3. (7 points) Check the assumptions for the simple linear regression. Attach any plots you used check
the assumptions and comment on them.
4. (7 points) We want to see if the average sleep time decreases as the children grow older. Write the
appropriate null and alternative…
Chapter 9 Solutions
MATLAB: A Practical Introduction to Programming and Problem Solving
Chapter 9, Problem 9.1PChapter 9, Problem 9.2PChapter 9, Problem 9.4PChapter 9, Problem 1EChapter 9, Problem 3EChapter 9, Problem 4EChapter 9, Problem 5EChapter 9, Problem 6EChapter 9, Problem 7EChapter 9, Problem 8E
Chapter 9, Problem 10EChapter 9, Problem 11EChapter 9, Problem 12EChapter 9, Problem 13EChapter 9, Problem 14EChapter 9, Problem 16EChapter 9, Problem 17EChapter 9, Problem 18EChapter 9, Problem 19EChapter 9, Problem 20EChapter 9, Problem 21EChapter 9, Problem 22EChapter 9, Problem 23EChapter 9, Problem 24EChapter 9, Problem 25EChapter 9, Problem 26EChapter 9, Problem 27EChapter 9, Problem 29EChapter 9, Problem 31EChapter 9, Problem 33E
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- Suppose we are interested in purchasing a multi-functioning inkjet printer. We want to see how the performance factors related to the price of the printer. Collected data from 20 printers include below information. PPM: Printing rate (pages per minutes) for a set of print jobs Price: Typical retail price (in dollars) at the time of the review. Data is not provided to you, but the default MINITAB output is provided to you. As you can see it is a partial output where you have to do some calculations using the provided information. Use the provided output to answer below questions. Regression Analysis: Price versus PPM Analysis of Variance DF Adj SS Adj MS F-Value P-Value Source Regression 1 PPM 1 74540 74540 74540 74540 21.75 0.000 21.75 0.000 Error 18 Lack-of-Fit 11 44191 Pure Error 7 17506 61697 3428 4017 2501 161 0.271 Total 19 136237 Model Summary S 58.5457 R-sq R-sq(adj) R-sq(pred) 54.71% 52.20% 42.25% Coefficients Term Coef SE Coef T-Value Constant PPM -94.2 90.9 56.4 -1.67 P-Value…arrow_forwardPlease answer Question 4arrow_forwardA researcher conducts an experiment to examine the relationship between the weight gain of chickens whose diets had been supplemented by different amounts of amino acid lysine and the amount of lysine ingested. Since the percentage of lysine is known, and we can monitor the amount of feed consumed, we can determine the amount of lysine eaten. A random sample of twelve 2-week-old chickens was selected for the study. Each was caged separately and was allowed to eat at will from feed composed of a base supplemented with lysine. The ample data summarizing weight gains and amounts of lysine eaten over the test period are given below. (In the data ✓, y represents weight gain in grams, and x represents the amount of lysine ingested in grams.) Chick y X 1 14.7 0.09 2 17.8 0.14 3 19.6 0.18 4 18.4 0.15 5 20.5 0.16 6 21.1 0.23 7 17.2 0.11 8 18.7 0.19 9 20.2 0.23 10 16.0 0.13 11 17.8 0.17 12 19.4 0.21 1. (3 points) Create a scatterplot of the data using Minitab and paste it below. Does a linear…arrow_forward
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