A company has 250 employees. In order to find the tardiness of the employees the company decided to ask 10 employees from each of the 5 floors of the building what example of sampling is this?
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- The operations manager of a Soft drink company is concerned about Machine No.3 in the assembly line. In order to make sure that the machine is operating correctly, samples are taken, and the average and range for each sample is computed. Each sample consists of 10 items produced from that machine. Recently, 12 samples were taken and the sample range and average computed for each are as follows: Sample Number Sample Range Sample Mean 1 1.00 45 2 1.21 44 3 0.81 45 4 1.00 46 5 1.11 47 6 0.72 46 7 0.76 49 8 1.01 48 9 1.02 50 10 0.89 51 11 0.76 49 12 1.10 51 During installation, the supplier set an average of 46 for the process with an average range 0.9. (a) Draw the appropriate control charts for machine No. 3. (b) Comment on your results.Suppose a manufacturing process produces small metal rods. The desired length of these rods is 50 cm. Quality control personnel take samples of 5 rods every hour and measure their lengths. After 8 hours, they have the following data for the average lengths (in cm) of the 8 samples: Hour (h): 1, 2, 3, 4, 5, 6, 7, 8Average Length (X-bar): 49.8, 50.2, 50.1, 49.9, 50.3, 50.1, 49.7, 50.0 Additionally, the standard deviation (s) for each sample is provided: Hour (h): 1, 2, 3, 4, 5, 6, 7, 8Standard Deviation (s): 0.1, 0.12, 0.11, 0.1, 0.12, 0.11, 0.09, 0.1 Based on the given data, is the process under control?9. Two machines are currently in use in a process at the Dennis Kira Mfg. Co. The standards for this process are LSL = .470" and USL = .476". Machine One is currently producing with mean = .474" and standard deviation .0003". Machine Two is currently producing with mean .4745" and standard deviation .0002". Which machine has the higher capability index? Machine One has an index of (round your response to two decimal places). (round your response to two decimal places). Machine Two has an index of Machine (1) (1) Two One has the higher capability index.
- The temperature of a burrito served to a customer in a local Mexican restaurant A: Discrete B; ContinousThe IRS is concerned with improving the accuracy of tax information given by its representatives over the telephone. Previous studies involved asking a set of 25 questions of a large number of IRS telephone representatives to determine the proportion of correct responses. Historically, the averageproportion of correct responses has been 72 percent. Recently, IRS representatives have been receiving more training. On April 26, the set of 25 tax questions were again asked of 20 randomly selected IRS telephone representatives. The numbers of correct answers were 18, 16, 19, 21, 20, 16,21, 16, 17, 10, 25, 18, 25, 16, 20, 15, 23, 19, 21, and 19. a. What are the upper and lower control limits for the appropriate p-chart for the IRS? Use z = 3. b. Is the tax information process in statistical control?20. A large national producer of cookies and baked goods uses a c chart to monitor the number of chocolate chips in its chocolate chip cookies. The company would like to have an average of six chips per cookie. One cookie is sampled each hour. The results of the last 12 hours were Number of Chips per Cookie Number of Chips per Cookie Hour Hour 1 7 7 3 2 8 6 3 4 3 3 4 3 10 2 5 5 11 4 4 12 4 a. Assuming a target value of c = 6, what are the upper and the lower control lim- its for a c chart? b. Are the 12 observations consistent with a target value of c = 6? If those 12 ob- servations constitute a baseline, what upper and lower control limits result? (Use the normal approximation for your calculations.)
- Which of the following is a basic step in selecting a sample from a population regardless of the specific technique being used? Select one: a. Identify the population b. All of these option c. Define the sample size d. Select a sampleA Quality Analyst wants to construct a control chart for determining whether three machines, all producing the same product, are under control with regard to a particular quality variable. Accordingly, he sampled four units of output from each machine, with the following results : Machine #1 measurements [17, 12, 21, 12]; Machine #2 measurements [ 14, 22, 16, 13]; Machine #3 measurements [ 13, 19, 14, 23]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? O a. 23.15and 9.52 O b. 44.33and -11.67 Oc. 25.85and 6.813 O d. 18.85and 13.81While analyzing their annual sales data (liters of wine sold per year) for the past 30 years, a vineyard found that after taking four successive differences, the resulting data had a mean of 2458 liters and looked like a stationary process (e.g. white noise). If the actual data for the past four years were 2018 - 2134 liters, 2017 - 2403 liters, 2016 - 2076 liters, and 2015 - 2290 liters. What would be a reasonable forecast for sales in 2019? Explain.
- A Quality Analyst wants to construct a control chart for determining whether three machines, all producing the same product, are under control with regard to a particular quality variable. Accordingly, he sampled four units of output from each machine, with the following results : Machine #1 measurements [14, 13, 24, 22]; Machine #2 measurements [ 14, 19, 23, 14]; Machine #3 measurements [ 14, 16, 13, 16]. Using the factors for three sigma control limits, what are x-bar chart upper and lower control limits? a. 24.65and 9.013 b. 22.43and 11.24 c. 18.9and 14.76 d. 39.83and -6.167An avant-garde clothing manufacturer runs a series of high-profile, risque ads on a billboard on Highway 101 and regularly collects protest calls from people who are offended by them. The company has no idea how many people in total see the ad, but it has been collecting statistics on the number of phone calls from irate viewers: a) Choose the correct Pareto chart below. O A. Frequency (number) LL WROMI O B. Frequency (number) Type R M W I O Description Offensive racially/ethnically Demeaning to men Demeaning to women Ad is Incomprehensible Other RMWO Frequency (number) LONDO Number of Complaints 12 4 13 2 7 WROMI O Frequency (number) OFONSO 12- RM WIOThe time needed for performing a machining operation is to be investigated. Historically, the process has had a standard deviation equal to 0.146 minutes. The means (in minutes) of 39 samples of n = 6 are: sample mean sample mean sample mean 1 3.86 14 3.81 27 3.81 2 3.90 15 3.83 28 3.86 3 3.83 16 3.86 29 3.98 4 3.81 17 3.82 30 3.96 5 3.84 18 3.86 31 3.88 6 3.83 19 3.84 32 3.76 7 3.87 20 3.87 33 3.83 8 3.88 21 3.84 34 3.77 9 3.84 22 3.82 35 3.86 10 3.80 23 3.89 36 3.80 11 3.88 24 3.86 37 3.84 12 3.86 25 3.88 38 3.79 13 3.88 26 3.90 39 3.85 the averagee of the 39-sample means is equal to 3.85. construct an xbar-chart for this process with two-sigma limits. Is the process in control?