of the garages take 28.7 hours or less to erect? z(28.7) = (28.7-32)/2 = -3.3 P(0 < x < 28.7) = P (-10 < z < -3.3) = 0.00048348... d. Of the garages‚ 5 percent take how many hours or more to erect? find the z-value corresponding to an area of 95% to the left and only 5% to the right under the curve. Use your z-chart or InvNor(0.95) = 1.645 on your calculator. Now find the x-value corresponding to that z-value. 1.645 = (x-32)/2 x-32 = 2*1.645 x= 35.29 hours 5% of the houses require 35
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statistical process controls and make the necessary improvements. The paper will employ various examples and calculations along with supporting data to explain control limits and its importance to the statistical process control. The effects of seasonal factors and its relevance to a process will also be highlighted and how confidence intervals are important in giving insights into data sets that improve the entire statistical process control. Process Improvement Plan In every successful organization
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using a confidence interval. The logic is very simple and straightforward. Assume we use StatCrunch to create a 95% confidence interval for the number of Facebook friends for Kaplan University MM207 students and find that the interval is between 75 friends and to 125 friends. Now‚ one of your classmates claims that the average number of Facebook friends is 150. Does this claim make sense in light of your confidence interval? No it does not. If a claim is not within a specified confidence interval
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RES/341 Final Examination Study Guide This study guide will prepare you for the Final Examination you will complete in the final week. It contains practice questions‚ which are related to each week’s objectives. In addition‚ refer to each week’s readings and your student guide as study references for the Final Examination. Week One: Defining Research Process and Data Measurement Objective: Define business research and its purpose. 1. The main distinction between applied and basic business
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1. A radio station that plays classical music has a “By Request” program each Saturday night. The percentage of requests for composers on a particular night are listed below: Composers Percentage of Requests Bach 5 Beethoven 26 Brahms 9 Dvorak 2 Mendelssohn 3 Mozart 21 Schubert 12 Schumann 7 Tchaikovsky 14 Wagner 1 a. Does the data listed above comprise a valid probability distribution? Explain.
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vein size is found to be 7.8mm with an SD of 2.1. Using a t distribution table‚ what are the confidence limits for a 95% confidence interval? For a 99% confidence interval? 95% confidence interval results: μ : population mean Confidence limits for a 95% confidence interval are 7.2031865 ≤ 7.8 ≤ 8.396813 99% confidence interval results: μ : population mean Confidence limits for a 99% confidence interval are 7.004095 ≤ 7.8 ≤ 8.595905 4. In a pilot study evaluating the use of a new drug
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ACL Chapter 9 Problems Problem 1 In addition to determining sample size‚ ACL can also select a random sample for you. Draw a sample of Accounts Receivable (AR) transactions from the Roger Company AR table assuming the confidence is 95‚ the upper error limit is 9 percent‚ and the expected error rate is 5 percent. 1. Open the Roger_Company_AR table 2. Select Sampling >> Sample Records and the Sample window appears 3. Make sure Record is the chosen Sample Type 4. Under Sample
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is not supported explain how to mitigate the issue in the future. In order to statistically find a cause in the shortage a hypothesis testing is conducted by finding the mean‚ median‚ and standard deviation for ounces in the bottles. Constructing a 95 percent interval will establish the mean of the population since the mean of the population is not known. There are thirty soda bottles being pulled for investigation. The mean will be calculated by averaging the amount of ounces in each bottle
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groups’ population sizes. After two weeks of sampling and counting the population of mealworms‚ a population of 506 mealworms was calculated. A very broad confidence interval was also calculated‚ ranging from 143.58 to 868.42 (Table 1). Although other groups seem to have large confidence intervals‚ they are within a 200-300 limit. The confidence interval calculated for Group RG/CL has about a 700 difference. Thus‚ their values obtained certainly reveal that experimental errors are involved. However
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for determining the sample size. SAMPLE SIZE CRITERIA In addition to the purpose of the study and population size‚ three criteria usually will need to be specified to determine the appropriate sample size: the level of precision‚ the level of confidence or risk‚ and the degree of variability in the attributes being measured (Miaoulis and Michener‚ 1976). Each of these is reviewed below. The Level Of Precision The level of precision‚ sometimes called sampling error‚ is the range in which the
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