ST 509 Sample Questions - Test 2 Topics Distribution of the sample mean. Central Limit Theorem. Confidence intervals for a population mean. Confidence intervals for a population proportion. Sample size for a given confidence level and margin of error (proportions). Poll articles. Hypotheses tests for a mean‚ and differences in means (independent and paired samples). Sample size and power of a test. Type I and Type II errors. You will be given a table of normal probabilities. You may wish to be familiar
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set of data [2]. Before doing the statistical calculations‚ suspect values‚ which are the lowest and highest data obtained are evaluated in terms of its acceptability through the Q-test. It makes use of the tabulated critical values for different confidence levels in which the resultant value for the said test should not exceed‚ otherwise the datum is considered invalid and cannot be included in the course of the following calculations. Where Xq is the highest or the lowest datum‚ Xn is the closest
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MAT 2377C Final exam December 10‚ 2010 Time: 180 minutes Student Number: Family Name: First Name: Professor: Rafal Kulik This is an open book examination. Only non-programmable and non-graphic calculators are permitted. Record your answer to each question in the table below. Number of pages: 7 (including this one). Number of questions: 24. NOTE: At the end of the examination‚ hand in only this page. You may keep the questionnaire. Question 1 2 3 4 5 6 7 8 9 10 11 12 Answer Question
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Determination of KHP – Acid - Base Titration For determining purity of unknown KHP‚ acid – base titration was used. Molarity of titrant in this case NaOH was standardized as 0.04958(±0.00011) M. Purity of unknown KHP was calculated as 35.88(±0.16) %. • Introduction Acid – base titration is typical method of determining unknown figures. Acid – base titration means that by using neutralization between acid and base. Abrupt changing of pH says whether procedure is done or not. pH indicators
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(5 points) (c) What is the probability that [pic] will differ from the population mean by more than 0.7? (5 points) 4. In the library on a university campus‚ there is a sign in the elevator that indicates a limit of 16 persons. Furthermore‚ there is a weight limit of 2500 pounds. Assume that the average weight of students‚ faculty‚ and staff on campus is 150 pounds with a standard deviation of 27 pounds‚ and that the distribution of weights of individuals on campus is approximately
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Chief Risk Officer) of a manufacturing firm. The CEO asks you to design a risk management program for workplace injuries and says that she is willing to establish an internal risk management program (e.g.‚ a self-insurance program) if with a 95% confidence‚ your firm will not have more injuries than 125% of the expected value. You tell the CEO that you need to assess if your firm has enough number of employees in order to establish such a program‚ and then takes on the task to find out.
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probability that X is less than 53.0. Choose one answer. a. 0.5589 b. 0.0401 c. 0.9599 d. 0.0802 Question2 Marks: 1 Use the given degree of confidence and sample data to find a confidence interval for the population standard deviation. Assume that the population has a normal distribution. Weights of eggs: 95% confidence; n = 22‚ x = 1.77 oz‚ s = 0.47 oz Choose one answer. a. (0.38 oz; 0.63 oz) b. (0.36 oz; 0.67 oz) c. (0.36 oz; 0.65 oz) d. (0.37 oz; 0.61 oz)
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Asymmetric Curve Statistical Inference The Central Limits Theorem: When samples are large (above 30) the sampling distribution will take the shape of a normal distribution regardless of the shape of the population Ultimate Goal Accepting or Rejecting the NULL hypothesis Accept or Reject? We accept a null hypothesis when the significance level greater than .05 Reject when less than .05 Confidence Intervals First you have to know three things: Statistical inference:
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Amanda Mueller MBA6018 – Data Analysis Unit 3 Activity 1 January 23‚ 2013 Practical Application Scenario 1 In 2010‚ Playbill Magazine contracted Boos Allen to conduct a survey aimed at determining the average annual household income of Playbill readers. 300 readers were randomly pulled and sampled from the list of customers provided by Playbill Magazine. From that sampling effort‚ Boos Allen was confident that the population average household income is $119‚155 and that the population
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(RSD) | 2.4658 | 8.3728 | Range (R) | 0.0376 0.0003 | 0.166 0.0003 | Relative Range (RR) | 6.9892 4.1935 | 30.817 18.490 | Confidence Limits (CL) | 5.3797 0.01392 | 5.3866 0.04222 | The measures of central
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