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- A manufacturer of aircraft engines uses a sequential sampling plan to accept or reject incoming lots of microprocessors used in the engines. Assume an AQL of 1 percent and an LTPD of 5 percent. Determine a sequential sampling plan assuming α =.05, β = .10. Graph the acceptance and rejection regions.Consider the double sampling plan for Spire CDs presented given.a. Suppose that the true proportion of defectives in the lot is 10 percent. On average, how many items will have to be sampled before the lot is either accepted or rejected?b. Suppose that the true proportion of defectives in the lot is 30 percent. On average, how many items will have to be sampled before the lot is either accepted or rejected?Sketch the OC curve for a sampling plan having asample size of 25 and an acceptance number of 2.
- In Exercises 9–20, identify which of these types of sampling is used: random, systematic, convenience, stratified, or cluster. Driving A student of the author conducted a survey on driving habits by randomly selecting three different classes and surveying all of the students as they left those classes.1. Is selecting one professor to be a member of the University Senate and then selecting one professor from the same group to be a member of the curriculum committee. Is this a sampling with replacement or sampling without replacementIn Exercises 9–20, identify which of these types of sampling is used: random, systematic, convenience, stratified, or cluster. Exit Polls During the last presidential election, CNN conducted an exit poll in which specific polling stations were randomly selected and all voters were surveyed as they left the premises.
- At Statsville High School the administration wants to sample 15% of the students to determine if students would prefer a semester timetable. The student body is comprised of:240 students in grade 9220 students in grade 10205 students in grade 11190 students in grade 12a) Determine the number of students required to survey if they wish to use a sample of 15% of the total number of students in the school.b) If they wish to use a stratified-sampling procedure, determine how many students from each grade will be considered in the sample.The method of selecting a desirable portion from a population which describes the characteristics of whole population is called as a. Sampling b. Segregating c. Dividing d. ImplantingA. When the sample is selected by picking people based on their position on a list using a sampling interval, what type of sampling is being done? B. When the sample is selected by breaking the sample up into groups based on a preexisting quality and samples from each of the existing groups, what type of sampling is being done? C. If a researcher is given a list of all 51,000 students that go to the university and each student has a 10% chance of being selected to participate in the study, what type of sampling has occurred? Options: Cluster Stratified Convienence Systematic Simple Random
- In a region divided into three districts, there are 227 Wi-Fi points. A new ITC operator decides to perform a survey on these three districts to evaluate the installation of additional hotspots. A sampling plan will be implemented to carry out the survey. Following is the table of the Wi-Fi points, together with the SD (miles) and their sampling cost.District Wi-Fi points SD * miles Sampling Cost 1 68 34 10 2 143 20 14 3 16 59 18Use the stratified sampling procedure to calculate the stratum sample size that minimizes costs.A university dean is interested in determining the proportion of students who recieve some sor of financial aid. Rather than examine the records for all students, the dean randomly selects 200 students and finds that 118 of them are receiving financial aid. If the dean wanted to estimate the proportion of all students receiving financial aid to within 4% with 90% reliabilty, how many students would need to be sampled?1) Decide whether these sampling methods produce a simple random sample of students from a class of 30 students. If not, explain why not. a) Select the first six students on the class roll sheet. b) Pick a digit at random and select those students whose phone number ends in that digit. c) If the classroom has six rows of chairs with five seats in each row, choose a row at random and select all students in that row. d) If the class consists of 15 males and 15 females, assign the males the numbers from 1 to 15 and the females the numbers from 16 to 30. Then use a random digit table to select six numbers from 1 to 30. Select the students assigned those numbers for your sample. e) If the class consists of 15 males and 15 females, assign the males the numbers from 1 to 15 and the females the numbers from 16 to 30. Then use a random digit table to select three numbers from 1 to 15 and three numbers from 16 to 30. Select the students assigned those numbers for your…