Matlab, Fourth Edition: A Practical Introduction to Programming and Problem Solving
4th Edition
ISBN: 9780128045251
Author: Stormy Attaway Ph.D. Boston University
Publisher: Elsevier Science
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Chapter 8, Problem 32E
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The following data show the results of two random samples that measured the average number of minutes
per charge for AA Lithium-ion (Li-ion) rechargeable batteries versus Nickel-Metal Hydride (NiMH)
rechargeable batteries.
Click this button to reveal the data. Click again to collapse it.
Li-ion
NiMH
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95
91
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If you want to do well, please avoid using Google sheets.
Perform a hypothesis test using significance level (a) = .02 to determine if the true average number of
minutes per charge for NiMH batteries is different from that for Li-ion batteries.
a. Perform a two-sample t test to test the claim that the true average number of minutes per charge
for Li-ion batteries is different from that for NiMH batteries.
Fill in the blanks for the alternative hypothesis of this test.
Select an answer Select an answer
Based on your work, answer the following questions.
The observed difference in mean…
mts
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urces
A group of economists wants to compare the mean annual leave among the US and EU workers. Two
samples of US and EU workers were obtained independently and analyzed.
The sample of 45 US workers had the mean annual leave of 18.8 days and the standard deviation 9.05 days.
The sample of 31 EU workers had the mean annual leave of 25.6 days and the standard deviation 5.38 days.
Use 4% level of significance to decide whether there is sufficient evidence that mean annual leave of US
workers is less than mean annual leave of EU workers.
Procedure: Two means T Hypothesis Test
Assumptions: (select everything that applies)
Normal populations
The number of positive and negative responses are both greater than 10 for both samples
Population standard deviations are known
Simple random samples
Population standard deviation are unknown and not assumed equal
Sample sizes are both greater than 30
Independent samples
Paired samples
Population standard deviation are unknown but assumed equal…
How do the assumptions and characteristics of the linear regression model influence the reliability and robustness of inference drawn from its results in diverse research scenarios?
Chapter 8 Solutions
Matlab, Fourth Edition: A Practical Introduction to Programming and Problem Solving
Chapter 8, Problem 8.1PChapter 8, Problem 8.2PChapter 8, Problem 8.3PChapter 8, Problem 8.4PChapter 8, Problem 8.5PChapter 8, Problem 8.6PChapter 8, Problem 1EChapter 8, Problem 2EChapter 8, Problem 3EChapter 8, Problem 4E
Chapter 8, Problem 5EChapter 8, Problem 6EChapter 8, Problem 7EChapter 8, Problem 8EChapter 8, Problem 9EChapter 8, Problem 10EChapter 8, Problem 11EChapter 8, Problem 12EChapter 8, Problem 13EChapter 8, Problem 14EChapter 8, Problem 15EChapter 8, Problem 16EChapter 8, Problem 17EChapter 8, Problem 18EChapter 8, Problem 19EChapter 8, Problem 20EChapter 8, Problem 21EChapter 8, Problem 22EChapter 8, Problem 23EChapter 8, Problem 24EChapter 8, Problem 25EChapter 8, Problem 26EChapter 8, Problem 27EChapter 8, Problem 30EChapter 8, Problem 31EChapter 8, Problem 32EChapter 8, Problem 33EChapter 8, Problem 34EChapter 8, Problem 35E
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- A group of economists wants to compare the mean annual leave among the US and EU workers. Two samples of US and EU workers were obtained independently and analyzed. The sample of 45 US workers had the mean annual leave of 18.8 days and the standard dediation 9.05 days. The sample of 31 EU workers had the mean annual leave of 25.6 days and the standard deviation 5.38 days. Use 4% level of significance to decide whether there is sufficient evidence that mean annual leave of US workers is less than mean annual leave of EU workers. Procedure: Select an answer Assumptions: (select everything that applies) Normal populations The number of positive and negative responses are both greater than 10 for both samples Population standard deviations are known Simple random samples Population standard deviation are unknown and not assumed equal Sample sizes are both greater than 30 Independent samples Paired samples Population standard deviation are unknown but assumed equal Part 1: Hypothesis Test..…arrow_forwardA group of economists wants to compare the average annual leave among the US and EU workers. Two samples of US and EU workers were obtained independently and analyzed. The sample of 37 US workers had the average annual leave of 18 days and the standard deviation 9.07 days. The sample of 40 EU workers had the average annual leave of 26.8 days and the standard deviation 5.11 days. Use 10% level of significance to decide whether there is sufficient evidence that average annual leave of US workers is less than average annual leave of EU workers. Procedure: Two means T Hypothesis Test Assumptions: (select everything that applies) Population standard deviations are known Population standard deviation are unknown but assumed equal Independent samples Paired samples The number of positive and negative responses are both greater than 10 for both samples Sample sizes are both greater than 30 Population standard deviation are unknown and not assumed equal Normal populations Simple random samples…arrow_forwardLEAVE! A group of economists wants to compare the average annual leave among the US and EU workers. Two samples of US and EU workers were obtained independently and analyzed. The sample of 37 US workers had the average annual leave of 18 days and the standard deviation 9.07 days. The sample of 40 EU workers had the average annual leave of 26.8 days and the standard deviation 5.11 days. Use 10% level of significance to decide whether there is sufficient evidence that average annual leave of US workers is less than average annual leave of EU workers. Procedure: Two means T Hypothesis Test Assumptions: (select everything that applies) Population standard deviations are known Population standard deviation are unknown but assumed equal Independent samples Paired samples D The number of positive and negative responses are both greater than 10 for both samples Sample sizes are both greater than 30 Population standard deviation are unknown and not assumed equal Normal populations Simple random…arrow_forward
- Fall 2025 Home C Canvas - Homework 6 Secure Exam Proctor Proctorio) Announcements Modules A group of economists wants to compare the mean annual leave among the US and EU workers. Two samples of US and EU workers were obtained independently and analyzed. The sample of 34 US workers had the mean annual leave of 14.7 days and the standard deviation 7.95 days. The sample of 32 EU workers had the mean annual leave of 23.5 days and the standard deviation 3.86 days. Use 10% level of significance to decide whether there is sufficient evidence that mean annual leave of US workers is less than mean annual leave of EU workers. Procedure: Two means T Hypothesis Test くくる Discussions eople Grades enji brary Resources ampus Resources Assumptions: (select everything that applies) Independent samples simple random samples Population standard deviations are known Normal populations The number of positive and negative responses are both greater than 10 for both samples Population standard deviation are…arrow_forwardoctor es ces A group of economists wants to compare the mean annual leave among the US and EU workers. Two samples of US and EU workers were obtained independently and analyzed. The sample of 34 US workers had the mean annual leave of 14.7 days and the standard deviation 7.95 days. The sample of 32 EU workers had the mean annual leave of 23.5 days and the standard deviation 3.86 days. Use 10% level of significance to decide whether there is sufficient evidence that mean annual leave of US workers is less than mean annual leave of EU workers. Procedure: Two means T Hypothesis Test Assumptions: (select everything that applies) Independent samples Simple random samples Population standard deviations are known Normal populations The number of positive and negative responses are both greater than 10 for both samples Population standard deviation are unknown but assumed equal Paired samples Sample sizes are both greater than 30 Population standard deviation are unknown and not assumed equal…arrow_forwardQuestion 4 ANNUAL LEAVE 2.19/3 pts 29 Part 1 of 6 A group of economists wants to compare the mean annual leave among the US and EU workers. Two samples of US and EU workers were obtained independently and analyzed. The sample of 34 US workers had the mean annual leave of 14.7 days and the standard deviation 7.95 days. The sample of 32 EU workers had the mean annual leave of 23.5 days and the standard deviation 3.86 days. Use 10% level of significance to decide whether there is sufficient evidence that mean annual leave of US workers is less than mean annual leave of EU workers. Procedure: Select an answer Assumptions: (select everything that applies) Independent samples Simple random samples Population standard deviations are known Normal populations The number of positive and negative responses are both greater than 10 for both samples Population standard deviation are unknown but assumed equal Paired samples Sample sizes are both greater than 30 Population standard deviation are…arrow_forward
- You may want to use the Excel Two Means Calculator found in the Course to complete this problem. You want to estimate the difference between the mean GPA of day students (Group 1) and the mean GPA of night students (Group 2) with a 94% confidence. A random sample of 13 day students and 14 night students and their GPA's are recorded below. It is reasonable to assume samples represent populations with normal distributions. Click this button to reveal the data. Click again to collapse it. GPA-Day GPA-Night 3.22 3.19 3.36 3.19 3.6 3.1 2.97 3.09 3.11 3.36 2.57 3.18 3.46 3.43 3.01 3.13 3.06 3.15 3.31 3.12 3.22 3.4 3.06 3.27 2.97 3.18 3.38 Click Download CSV to download csv file of data or copy/paste the data into Excel. After downloading the file, you may want to save it as an Excel Workbook. All conditions are met for inference using Two-Sample T-Confidence Interval because there are two independent random samples and populations have normal distributions. Round answers properly to 2…arrow_forwardProctor ents An economist wants to compare average hourly rate charged by automobile mechanics in two suburbs. She randomly selects auto repair facilities from both suburbs and records their hourly rates (in dollars). The data are as follows: Click this button to reveal the data. Click again to collapse it. Suburb1 Suburb2 39.5 44.6 33.3 39.5 43.9 29.6 37.7 31.2 42 44.3 32.9 46.3 33.5 46.4 46 47.3 41.6 20.1 43.4 33.9 ources 34.1 45.6 44.3 44.1 esources 43.1 35.8 36.5 36.6 42.1 32.5 Note: If using Excel, after copying the given data, use Paste Special and select "Unicode Text" to paste the data properly. After pasting, double check the number of data in each column to make sure those are pasted properly. If using Ti calculator, check sum of the data before analyzing: 593.9 for Suburb 1 and 577.8 for Suburb 2 Use 3% level of significance to decide whether there is sufficient evidence that the average hourly rate charged by automobile mechanics in suburb 1 is greater than the average…arrow_forward3:51 myopenmath.com Get a similar question You can retry this question below 89 סוי 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 μ₁ be the average number of students per class for the Portland Public School district. Let u₂ be the average number of students per class for the Beaverton School district. Assume the populations are normally distributed. A random sample of 28 Portland classes found a mean of 33 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 4. a. Find a 98% confidence interval for the difference of the means. Use Excel Two Means Calculator found in the Course and round answers to 2 decimal places. <11-12 < b. Select the correct conclusion based on the < above confidence interval. Since the above dencente…arrow_forward
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