3. An industry is considering the revision of its retirement policy and wants to estimatethe proportion of employees that favor the new policy. The industry consists of 87separate plants located throughout the United States. Because the results must beobtained quickly and with little cost, the industry decides to use cluster sampling witheach plant as a cluster. A simple random sample of 15 plants is selected, and theopinions of the employees in these plants are obtained by questionnaire. The resultsare as shown in the accompanying table.Number ofemployees, miNumber favoringnew policy, aiPlant151422625334940473455101634831 765388493097354106145115851125229136546144937155542a. Estimate the proportion of employees in the industry who favor the newretirement policy, and place a bound on the error of estimation.b. The industry modified its retirement policy after obtaining the results of thesurvey. It now wants to estimate the proportion of employees in favor of themodified policy. How many plants should be sampled to have a bound of 0.08on the error of estimation? Use the data above to approximate the results ofthe new survey.

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Answered: 3. An industry is considering the…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A researcher divided subjects into two groups according to gender and then selected a fixed proportion of members from each group for his sample. What sampling method was the researcher using? A. Stratified sample. B. Simple random sample. C. Voluntary response sample. D. Cluster sample.
sixty-five percent of those surveyed reply No to a certain question. If 234 reply No, what is the sample size?
A political scientist is interested in the effect of government type on economic development, She wants to use a sample of 30 countries evenly represented among the Americas, Europe, Asia, and Africa to conduct her analysis. What type of study should she use to ensure that countries are selected from each region of the world? a. Observational - simple random sampling b. Observational - cluster sampling c. Observational - stratified sampling d. Experimental
In 1942, an organization surveyed 1100 adults and asked, "Are you a total abstainer from, or do you on occasion consume, alcoholic beverages?" Of the 1100 adults surveyed, 440 indicated that they were total abstainers. In a recent survey, the same question was asked of 1100 adults and 418 indicated that they were total abstainers. Complete parts (a) and (b) below. (a) Determine the sample proportion for each sample. and respectively. The proportions of the adults who took the 1942 survey and the recent survey who were total abstainers are (Round to three decimal places as needed.)
The department head of a private secondary school in Marikina City surveyed randomly selected students from each grade level to know their readiness in limited face-to-face classes. a. Simple Random Sampling b. Systematic Sampling c. Stratified Sampling d. Cluster Sampling
1. Students from Sandalwood High School were asked, when given the choice between math or English, which class they preferred to take during first period. The data was broken down by gender: 55 males preferred math 52 males preferred English 42 females preferred math 51 females preferred English Part A: Fill in and complete the following contingency table. Circle the largest joint frequency and put a box around the smallest marginal frequency. Sandalwood High School Survey of Preferred First Period Class Math English Total Males Females Total Part B: Which subject was preferred as a first period class and by what percentage? Part C: Males preferred which subject more? Part D: What frequency does 103/200 represent?
A group of 40 students in a library was sampled and the type of laptop they were using was examined. It was found that 16 were using HP, 10 were using Lenovo, 6 were using Dell, 5 were using Microsoft, and 3 were using Apple. a. Use the given information to complete the following table: Laptop Type Frequency Relative Frequency HP % Lenovo c. What proportion of the students use HP? b. How many degrees will the segment representing "Lenovo" have on a pie chart? % d. What is the relative frequency for Apple? Dell Microsoft Apple
In one particular rainforest in Tasmania, it has been found that 70% of the trees are eucalyptus trees; 20% of the trees are Australian blackwood trees and 10% of the trees are myrtle beech trees. Unfortunately, this rainforest has recently been affected by bushfires; and we are interested in determining whether or not the above percentage distribution of trees has been affected by these bushfires. When the number of trees remaining were counted after several had been burnt down by the bushfires, it was found that there were a total of 500 trees left. Of these, 320 were eucalyptus trees; 120 were Australian blackwood trees and 60 were myrtle beech trees. A scientist would like to know if there is evidence of a significant change in the percentage distribution of trees aş a result of these unfortunate bushfires. (i) Use statistical notation to state the appropriate null and alternate hypotheses. (ii) Calculate the chi-squared test statistic for these data. (ii1) Given a p-value of 0.038…
1. Compare and contrast each of these sampling methods. Give examples for each one of them. a. cluster sampling b. stratified sampling c. snowball sampling
Based on market sales figures, approximately 7.9% of car owners in California own an electric or plug-in hybrid vehicle (EV). A marketing director at a local car dealership would like to know if their sales of EV's is any greater than what the state's sales proportions are. To examine this, they look over the last 500 sales (which they consider to be a representative sample of all car sales) and determine that 10.4% of those were EV sales. Is this statistically significant evidence that the dealership sells a higher proportion of EV's than the overall state's proportion? Which of the following are the correct null and alternative hypotheses for the hypothesis test used to determine significance? Ho:p = 0.079 Haip > 0.079 %3D O Ho:p = 0.079 Hai p > 0.104 O Ho:p 0.079 O Ho:p 0.104
In which one of the following sampling techniques, the samples are selected based on the proportion of the categories? a. Stratified sampling b. Cluster sampling c. Systematic sampling d. Random Sampling

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