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- (a) What is the minimum number of students that will need to be observed to get a margin of error of 0.08 with 99% confidence? (Use a table or technology.) students (b) Dr. Victory's school superintendent, Dr. Triumph, finds out about the study and tells him that in past studies, approximately 60% of middle school students have felt bullied. Will having this knowledge change how many students will be needed for Dr. Victory's students? Yes or no? YesNo (c) Now that Dr. Triumph has told Dr. Victory that in previous studies approximately 60% of students have felt bullied, what is the minimum number of students that will need to be observed to get a margin of error of 0.08 with 99% confidence? (Use a table or technology.) studentsThe human resource manager at a car dealership wants to know if the ages of its employees are related to the department that they work in. Data was compiled and tabulated in a 2-way contingency table. The employees were classified according to their age and department. d) What is the assumption on which these calculations are based? e) What is relevance of the statement” No cells with expected counts less than 5.”f) Do the records suggest a relationship or independence between age anddepartment for the employees of this car dealership at the 5% significance level? Give reason(s) for your answer.One of the questions on a survey of 1000 adults asked if today’s children will be better offthan their parents (Rasmussen Reports website, October 26, 2012). Representative dataare shown in the DATAfile named ChildOutlook. A response of Yes indicates that the adultsurveyed did think today’s children will be better off than their parents. A response of Noindicates that the adult surveyed did not think today’s children will be better off than theirparents. A response of Not Sure was given by 23% of the adults surveyed.a. What is the point estimate of the proportion of the population of adults who do thinkthat today’s children will be better off than their parents?b. At 95% confidence, what is the margin of error?c. What is the 95% confidence interval for the proportion of adults who do think thattoday’s children will be better off than their parents?d. What is the 95% confidence interval for the proportion of adults who do not thinkthat today’s children will be better off than their…
- A school psychologist notes that the average number of times that students are disrup- tive during class is 1.4 (u 1.4] times per day Following recent classroom policy changes the psychologist tests if the number of disrup- tions during class has changed. He records the following number of disruptions observed during a class day: 2, 4,3, 5, 4, 1, 1, and 4 1. Test the hypothesis that the number of complaints has increased or decreased using a .05 level of significance. State the value for the test stastistic and the decision to retain or rejct the null hypothesis. 2.compute effect size using estimated Cohen's D.a) If a store runs out of advertised material during a sale,customers become upset, and the firm loses not only the sale, butalso goodwill. From past experience, a record store finds that themean number of albums sold in a sale is 845, the variance is 225,and that a histogram of the demand appears mound shaped. Themanager is willing to accept a 2.5% chance that an album will besold out. About how many albums should the manager order for anupcoming sale? b) The yield of a variety ofwheat was measured on a series of small plots. The 2nd and 98thpercentile was found to be 29 bushels/acre and 41 bushels/acrerespectively. What is the standard deviation (bushels/acre)?A sample of 200 students at a Big-Ten university was taken after the midterm to ask them whether they went bar hopping the weekend before the midterm or spent the weekend studying, and whether they did well or poorly on the midterm. The following table contains the result. Did Well in Midterm Did Poorly in Midterm Studying for Exam 80 20 Went Bar Hopping 30 70 If the sample is a good representation of the population, we can expect ________ percent of those who spent the weekend studying to do poorly on the midterm.
- A lecturer at WIN wanted to know if he can predict student’s quiz results by asking them tocomplete a simple survey. The result of the survey is found in the file: Assignment 2 sem22020data set 1. Quiz Results EQR Study Hrs Age Sex BBT MB MC AuHS LM 15 10 3 19 0 0 1 1 0 1 14 15 4 24 0 0 1 0 0 1 9 15 1 20 0 10 1 0 0 1 6 10 3 21 0 0 1 1 0 1 14 15 4 21 0 9 1 0 0 1 12 10 6 21 0 2 0 1 0 1 12 13 2 21 1 8 1 0 0 0 15 15 0 20 0 8 1 0 0 1 12 15 3 20 0 10 1 0 0 1 13 15 0.2 19 0 8 1 0 0 1 15 15 2 20 0 6 1 0 1 1 12 14 5 20 0 5 1 1 1 1 14 15 7 22 0 8 0 0 0 0 7 7 10 21 1 7 0 0 1 0 11 15 5 24 0 0 1 0 0 1 10 10 3 22 1 0 1 0 0 1 13 11 3 23 1 1 1 1 1 1 13 15 2 22 1 8 0 0 0 0 13 12 4 20 1 7 1 0 1 0 13 10 3 20 1 0 1 0 0 1 8 13 5 20 1 8 0 0 0 0 12 13 5 22 0 5 0 0 0 1 13 15 8 22 0 5 0 1 0 1 10 13 4 23 1 7 1 0 0 1 13 13 0.5 20 1 0 0 0 0 0 12 13 0.5 20 1 0 1 0 0 0 15 15 2 21 0 10 1 0 0 1 10 13 6 22 0 6 1 1 0 1 11 8 5 20 0 10 0 0 1 0 12 10 4 19 1…A new women’s high heel dress shoe has been designed that is suppose to add support leading to improved comfort. The company wishes to get a sample that will rate the level of comfort provided by the new design of high heel shoes. Which sample described below would most likely be the best for this study? a) All of the customers at a Men’s Suit Store. b) Several professional football athletes c) All of the people onboard a Bering Strait crabbing boat. d) All of the women attending Ballroom Dance classes.A tire manufacturing company is interested in obtaining data on stopping distances for each of the three main tread types made by the company. The data collection method that would be most likely used in this case would be: A) demographic surveying. B) written questionnaire. C) experiments. D) telephone survey. Which of the following types of questions provide the respondent with the greatest choice in responding to a question? A) Closed-end questions B) True/false questions C) Multiple choice questions D) Open-end questions
- The Ignorance Survey: United Kingdon Exercise 4.113 refers to a survey used to assess the ignorance of the public to global population trends. A similar survey was conducted in the United Kingdom, where respondents were asked if they had a university degree. One question asked, “In the last 20 years the proportion of the world population living in extreme poverty has …,” and three choices were provided: 1)“increased” 2) “remained more or less the same,” and 3) “decreased.” Of 373 university degree holders, 45 responded with the correct answer: decreased; of 639 non-degree respondents, 57 responded with the correct answer.35 We would like to test if the percent of correct answers is significantly different between degree holders and non-degree holders. (a) What are the null and alternative hypotheses? (b) Using StatKey or other technology, construct a randomization distribution and compute the p-value. (c) State the conclusion in contextA Pew Research study conducted in 2017 found that approximately 75% of Americans believe that robots and computers might one day do many of the jobs currently done by people.† Suppose we have the following data collected from nurses, tax auditors, and fast-food workers in which a higher score means the person feels his or her job is more likely to be automated. Nurse TaxAuditor Fast-FoodWorker 4 4 5 4 5 8 5 6 6 2 3 8 2 6 5 3 3 6 4 5 5 6 2 5 (a)Use ? = 0.05 to test for differences in the belief that a person's job is likely to be automated for the three professions. State the null and alternative hypotheses. 1. H0: μNurse = μTax auditor = μFast-food worker Ha: Not all the population means are equal. 2. H0: Not all the population means are equal. Ha: μNurse = μTax auditor = μFast-food worker 3. H0: At least two of the population means are equal. Ha: At least two of the population means are different. 4. H0: μNurse ≠ μTax auditor ≠ μFast-food worker…A small college has been accused of gender bias in its admissions to graduate programs.a. Out of 500 men who applied, 255 were accepted. Out of 700 women whoapplied, 240 were accepted. Find the acceptance rate for each gender. Does thissuggest bias?b. The college then looked at each of the two departments with graduate programsand found the data below. Compute the acceptance rate within each departmentby gender. Does this suggest bias? c. Looking at our results from Parts A and b, what can you conclude? Is theregender bias in this college’s admissions? If so, in which direction?