rom a normal population must be used when_____________. A. The sample size is small. B. Standard deviation is unknown. C. Sample size is small and the standard deviation is unknown. D. Sample size is big and standard deviation is known
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1. The “t” test for samples from a normal population must be used when_____________.
A. The
B. Standard deviation is unknown.
C. Sample size is small and the standard deviation is unknown.
D. Sample size is big and standard deviation is known
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- 1. Five data entry operators work at the data processing department of the Birmingham Bank. Each day for 30 days, the number of defective records in a sample of 350 records typed by these operators has been noted, as follows: Sample No. No. Defectives Sample No. No. Defectives Sample No. No. Defectives 1 8 11 7 21 16 2 5 12 5 22 11 3 19 13 15 23 6 4 10 14 3 24 6 5 10 15 12 25 13 6 7 16 7 26 11 7 11 17 12 27 15 8 9 18 3 28 6 9 7 19 18 29 12 10 12 20 16 30 4 a) Establish 3σ upper and lower control limits. UCLp = . 055.055 (enter your response as a number between 0 and 1, rounded to three decimal places). LCLp =?(enter your response as a number between 0 and 1, rounded to three decimal places).In using a statistical formula to calculate sample size, information that is typically needed to do the calculation include the following, except a.desired level of confidence b.allowable margin of error c.response rate d.variability of population characteristic being studied e.all of the above belongQ1: Identify the sampling technique used in the above scenarios. B puts students' names in a hat and then selects his sample by picking 5 names, from his hat. B wants to check the airport security and for that he choose the first 50people to pass through a checkpoint. B wants to check the food quality of the products and for that he selects every 10thitems as her sample. B want to analyze the job satisfaction level among employees. He divided employees on the basis of “managers” and “non-managerial employees” and then randomly select 10 persons from each group. B want to study on gambling addiction and realized that it is difficult to get in contact with gambling addictive. He had however been in contact with one individual gambler in the initial phase of the study. When he interviewed him he asked if he had knowledge of other gamblers. The gambler gave references for two persons. When these two persons were interviewed, one gambler give reference…
- Find the minimum sample size n needed to estimate μ for the given values of c, σ, and E. c=0.98, σ=6.9, and E=1 Assume that a preliminary sample has at least 30 members.Sampling 4 pieces of precision-cut wire (to be used in computer assembly) every hour for the past 24 hours has produced the following results: Hour x R Hour x R Hour x R Hour x R 1 3.15" 0.71" 7 3.15" 0.58" 13 3.21" 0.80" 19 3.31" 1.61" 2 3.20 1.23 8 2.75 1.18 14 2.83 1.31 20 2.79 1.09 3 3.12 1.38 9 3.02 0.71 15 3.02 1.01 21 2.65 1.13 4 3.39 1.31 10 2.75 1.38 16 2.94 0.50 22 3.38 0.51 5 3.07 1.17 11 2.93 1.22 17 2.86 1.43 23 2.94 1.63 6 2.76 0.37 12 2.87 0.40 18 2.64 1.29 24 2.64 0.92 Based on the sampling done, the control limits for 3-sigma x chart are (round all intermediate calculations to three decimal places…The time needed for checking in at a hotel is to be investigated. Historically, the process has had astandard deviation equal to .146. The means of 39 samples of n = 14 areSample Mean Sample Mean Sample Mean Sample Mean1 3.86 11 3.88 21 3.84 31 3.882 3.90 12 3.86 22 3.82 32 3.763 3.83 13 3.88 23 3.89 33 3.834 3.81 14 3.81 24 3.86 34 3.775 3.84 15 3.83 25 3.88 35 3.866 3.83 16 3.86 26 3.90 36 3.807 3.87 17 3.82 27 3.81 37 3.848 3.88 18 3.86 28 3.86 38 3.799 3.84 19 3.84 29 3.98 39 3.8510 3.80 20 3.87 30 3.96a. Construct an x¯ -chart for this process with three-sigma limits. Is the process in control?b. Analyze the data using a median run test and an up/down run test. What can you conclude?
- Problem 10-5 (Algo) Using samples of 196 credit card statements, an auditor found the following:Use Table-A. Sample 1 2 3 4 Number with errors 4 3 6 9 Click here for the Excel Data File a. Determine the fraction defective in each sample. (Round your answers to 4 decimal places.) b. If the true fraction defective for this process is unknown, what is your estimate of it? (Round your answer to 1 decimal place.) c. What is your estimate of the mean and standard deviation of the sampling distribution of fractions defective for samples of this size? (Round your intermediate calculations and final answers to 4 decimal places.) d. What control limits would give an alpha risk of .03 for this process? (Round your intermediate calculations to 4 decimal places. Round your "z" value to 2 decimal places and other answers to 4 decimal places.) e. What alpha risk would control limits of .0470 and .0092 provide? (Round your intermediate calculations to 4 decimal…Sampling 4 pieces of precision-cut wire (to be used in computer assembly) every hour for the past 24 hours has produced the following results: Hour x R Hour x R Hour x R Hour x R 1 3.15" 0.76" 7 2.95" 0.48" 13 3.11" 0.85" 19 3.31" 1.66" 2 3.00 1.13 8 2.55 1.18 14 2.83 1.31 20 2.99 1.09 3 3.22 1.38 9 3.12 0.66 15 3.12 1.06 21 2.65 1.13 4 3.39 1.21 10 2.85 1.38 16 2.94 0.50 22 3.18 0.46 5 3.07 1.12 11 2.93 1.22 17 2.76 1.48 23 2.94 1.58 6 2.86 0.37 12 2.87 0.35 18 2.64 1.29 24 2.54 0.92 Based on the sampling done, the control limits for 3-sigma x chart are (round all intermediate calculations to three decimal places…1. HighQualityasavalueproposition:Paras took on himself to ensure quality becomes a top differentiator and a value proposition to its customers. They started working closely with beekeepers in the Himachali region around the Himalayan foothills and in Muzaffarpur, where they encourage ethical beekeeping. Ethical beekeeping is a format where a hundred per cent of the honey is harvested at no point. Only 60% will be taken out of the hives that, or through that process, at any point, 40% will be left back for the bees.Also, through the exploration and pursuit of pure honey, Paras came across multiflora honey, which is most commonly used as a source of honey. But unfortunately, adulteration happens when a blend of multiflora honey is packaged and sold. Paras ensured that the lab tested the source from which they collected the honey to ensure the promise of purity was kept at every stage. Moreover, while sourcing the honey, the honey twig ensured that it was entirely antibiotic-free.2.…
- 1. HighQualityasavalueproposition:Paras took on himself to ensure quality becomes a top differentiator and a value proposition to its customers. They started working closely with beekeepers in the Himachali region around the Himalayan foothills and in Muzaffarpur, where they encourage ethical beekeeping. Ethical beekeeping is a format where a hundred per cent of the honey is harvested at no point. Only 60% will be taken out of the hives that, or through that process, at any point, 40% will be left back for the bees.Also, through the exploration and pursuit of pure honey, Paras came across multiflora honey, which is most commonly used as a source of honey. But unfortunately, adulteration happens when a blend of multiflora honey is packaged and sold. Paras ensured that the lab tested the source from which they collected the honey to ensure the promise of purity was kept at every stage. Moreover, while sourcing the honey, the honey twig ensured that it was entirely antibiotic-free.2.…The 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?In 800 words, What is non probability sampling and explain the types of the sample