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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CHAPTER 10 HYPOTHESIS TESTING MULTIPLE CHOICE QUESTIONS In the following multiple-choice questions‚ please circle the correct answer. 1. If a researcher takes a large enough sample‚ he/she will almost always obtain: a. virtually significant results b. practically significant results c. consequentially significant results d. statistically significant results ANSWER: d 2. The null and alternative hypotheses divide all possibilities into: a. two
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Sample 9.23 A manufacturer of chocolate candies uses machines to package candies as they move along a filling line. Although the packages are labeled as 8 ounces‚ the company wants the packages to contain a mean of 8.17 ounces so that virtually none of the packages contain less than 8 ounces. A sample of 50 packages is selected periodically‚ and the packaging process is stopped if there is evidence that the mean amount packaged is different from 8.17 ounces. Suppose that in a particular of 50 packages
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approved price list. | Test of Control | Classification | Examine a sample of sales transactions to determine if each one is correctly classified in the sales journal. | Substantive Test of Transactions | Completeness‚ Accuracy‚ Timing‚ Posting‚ and summarization | N/A | Substantive Test of Transactions | Occurrence‚ Completeness‚ Accuracy‚ and Timing | N/A | Test of Control | Accuracy | Recalculate cash discounts for the sample of remittances to determine whether each one was consistent with
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1. According to the National Center for Health Statistics (2004)‚ 22.4% of adults are smokers. A random sample of 300 adults is obtained. (a) Describe the sampling distribution of phat‚ the sample proportion of adults who smoke. (b) In a random sample of 300 adults‚ what is the probability that at least 50 are smokers? (c) Would it be unusual if a random sample of 300 adults results in 18% or less being smokers? Explain your answer. 2. A machine at K&A Tube & Manufacturing
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Major Statistics Assignment Mary Grace Rivero 050853639 CNUR860-011 Vaska Micevski Friday‚ March 30‚ 2012 Major Statistics Assignment This major statistics assignment will finally pull together everything that was learned in this course. The application of all content within this course will be incorporated to three different research scenarios. Within each scenario‚ hypothesis testing will be done‚ followed by a discussion of relevant descriptive statistics and finally‚ a discussion
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management at Par Inc. believes that with the introduction of a cut-resistant‚ longer-lasting golf ball could increase their market share. A new golf ball coating designed to resist cuts and provide a more durable ball have been developed and tested. A sample of 40 balls of both the new and current models were tested with a mechanical hitting machine so that any difference between the mean distances for the two models could be attributed to a difference in the two models. Therefore‚ the hypothesis test
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spreadsheet attached‚ a sample size of 9 (n=9) participants enrolled in the study. Total cholesterol levels measured in children between ages 2 – 6 years was summarized at 1‚765. The sample mean (X) and standard deviation (S) computed as (1765/90) =196.1 and square root summation (X-X) square / n-1 =29.0 respectively. Now to generate a 95% confidence interval for the true mean total cholesterol levels in children from data collected‚ we used the z value for 95% as (z= 1.96). From sample statistics the confidence
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Math 221 Week 6 Lab Submitted by: Merima Ceric Part 1. Normal Distributions and Birth Weights in America 1) What percent of the babies born with each gestation period have a low birth weight (under 5.5 pounds)? a) Under 28 = 99.88% The NORMDIST formula was used to calculate: =NORMDIST(5.5‚1.88‚1.99‚True) X= 5.5 Mean= 1.88 Standard Deviation=1.19 b) 32 to 35 weeks = 43.83% The NORMDIST formula
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Stat-403/ 650/ 890 (BPK) – Assignment 1 2013 Spring Term . Question 1. Eating paint It has been estimated that lead poisoning resulting from an unnatural craving (pica) for substances such as paint may affect as many as a quarter of a million children each year‚ causing them severe‚ irreversible retardation. Explanations for why children voluntarily consume lead range from “improper parental supervision” to “a child’s need to mouth objects.” Some researchers‚ however‚ have been investigating
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