Quiz 8

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Southern New Hampshire University *

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243

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Industrial Engineering

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Dec 6, 2023

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Nichole Bruce-Balasch (username: nichole.bruce- balasch@snhu.edu) Attempt 1 Written: Jun 8, 2021 10:41 PM - Jun 8, 2021 10:49 PM Submission View You have successfully submitted the Module Eight quiz. Please review the learning resources or reach out to your instructor with any questions. Question 1 3 / 3 points A university conducted a survey of its recent graduates. The university wanted to measure the quality of a new Engineering course. A survey was conducted during the first offering of the course to evaluate its overall quality. The results of the survey are shown below: Needs Improvement: 55% Meets Expectations: 30% Excellent: 15% The university made improvements to the course earlier this year. Then it conducted another survey to evaluate how these improvements worked. A total of 500 students were surveyed. Their results are shown below: Needs Improvement: 175 students Meets Expectations: 225 students Excellent: 100 students You want to perform a chi-square test for goodness of fit, to see if students’ views have changed about the course. Which of the following Python scripts prints the P-value and test statistic for the chi-square test? Select one. Question options: from scipy.stats import chisquare statistic, pvalue = goodness_of_fit([175,225,100], f_exp=[275,150,75]) print(statistic) print(pvalue)

from scipy.stats import chisquare statistic, pvalue = chisquare([175,225,100], f_exp=[275,150,75]) print(statistic) print(pvalue) from scipy.stats import chisquare statistic, pvalue = chisquare([275,150,75], f_exp=[175,225,100]) print(statistic) print(pvalue) from scipy.stats import chisquare statistic, pvalue = goodness_of_fit([275,150,75], f_exp=[175,225,100]) print(statistic) print(pvalue) Question 2 3 / 3 points A biologist is studying the composition of birds on a lake and counts 61 ducks, 17 geese, 11 cranes, 15 swans, and 6 herons. From previous studies performed around the same time of the year, she expects 50% of the birds to be ducks, 23% to be geese, 12% to be cranes, 10% to be swans, and 5% to be herons. What are the correct null and alternative hypotheses for performing a chi-square goodness of fit test? Select one. Question options: Null Hypothesis H 0 : The distribution of birds observed follows the distribution from previous studies. Alternative Hypothesis H 1 : The distribution of birds observed does not follow the distribution from previous studies. Null Hypothesis H 0 : The distribution of birds observed does not follow the distribution from previous studies. Alternative Hypothesis H 1 : The distribution of birds observed follows the distribution from previous studies. Null Hypothesis H 0 : The distribution of birds observed follows the Normal distribution. Alternative Hypothesis H 1 : The distribution of birds observed does not follow the

Normal distribution. Null Hypothesis H 0 : The distribution of birds observed follows the Student’s t- distribution. Alternative Hypothesis H 1 : The distribution of birds observed does not follow the Student’s t-distribution. Question 3 3 / 3 points What is the use of the chi-square goodness of fit test? Select one. Question options: To test how close the distribution of a population is to an expected distribution To test how close the distribution of a population is to a Normal distribution To test the difference in three or more population means To test how close the distribution of a population is to a Student’s t-distribution Question 4 3 / 3 points Which of the following Python methods is used to perform chi-square goodness of fit tests? Select one. Question options: f_oneway from scipy.stats submodule chisquare from scipy.stats submodule tukeyhsd from scipy.stats submodule

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anova_lm from scipy.stats submodule Question 5 3 / 3 points A biologist is studying the composition of birds on a lake and counts 61 ducks, 17 geese, 11 cranes, 15 swans, and 6 herons. From previous studies performed around the same time of the year, she expects 50% of the birds to be ducks, 23% to be geese, 12% to be cranes, 10% to be swans, and 5% to be herons. What are the expected and observed counts? Select one. Question options: Expected = 61 ducks, 17 geese, 11 cranes, 15 swans, and 6 herons Observed = 55 ducks, 25 geese, 13 cranes, 11 swans, and 6 herons Expected = 61 ducks, 17 geese, 11 cranes, 15 swans, and 6 herons Observed = 61 ducks, 17 geese, 11 cranes, 15 swans, and 6 herons Expected = 55 ducks, 25 geese, 13 cranes, 11 swans, and 6 herons Observed = 55 ducks, 25 geese, 13 cranes, 11 swans, and 6 herons Expected = 55 ducks, 25 geese, 13 cranes, 11 swans, and 6 herons Observed = 61 ducks, 17 geese, 11 cranes, 15 swans, and 6 herons Attempt Score: 15 / 15 - A Overall Grade (highest attempt) : 15 / 15 - A

Quiz 8

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