Many parents allow underage children to drink alcohol in limited situations when an adult is present to supervise. The idea is that teens will learn responsible drinkinghabits if they first experience alcohol in a controlled environment. Other parents take a strict no-drinking approach. Researchers surveyed a sample of 200 studentsaged 14 to 17, about their alcohol use and about alcohol related problems. Using a=0.05, answer the questionsNo Alcohol related ProblemsAlcohol Related ProblemsNot allowed to drink71980Allowed to drink8931|12016040N=200What is the alternative hypothesis? [ Select]What is the null hypothesis? [ Select]What inferential test is being conducted? [ Select]What is the obtained statistic? [ Select ]What determines the critical value? [ Select ]What is the critical value? [ Select ]What is the decision rule? [ Select]What is your decision? [ Select]What is your conclusion? [ Select ]

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ENGR.ECONOMIC ANALYSIS

14th Edition

ISBN:9780190931919

Author:NEWNAN

Publisher:NEWNAN

Chapter1: Making Economics Decisions

Section: Chapter Questions

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The table below shows data on a subsample of participants in the 7th examination of the Framingham Offspring Study. Characteristic n Sample Population Standard Мean Deviation Systolic Blood 10 121.2 11.1 Pressure Diastolic Blood 10 71.3 7.2 Pressure Total Serum 10 202.3 37.7 Cholesterol Weight 10 176.0 33.0 Height 10 67.175 4.205 Body Mass 10 27.26 3.10 Index Which of the following is the 95% confidence level for Systolic Blood Pressure 114.32, 128.08 120.98, 121.42 121.16, 121.24 112.16, 130.24
Textbook authors must be careful that the reading level of their book is appropriate for the target audience. Some methods of assessing reading level require estimating the average word length. We've randomly chosen 20 words from a randomly selected page in Intro Stats and counted the number of letters in each word: 5, 5, 2, 11, 3, 5, 6, 8, 5, 4, 7, 2, 9, 4, 8, 10, 4, 7, 6, 9 Suppose that our editor was hoping that the book would have a mean word length of 6.8 letters. Does this sample indicate that the authors failed to meet this goal? With a significance level of 0.05, test an appropriate hypothesis and state your conclusion. (i.e state the appropriate null and alternative hypotheses, calculate the test statistic, conclude and interpret it).
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Об. A survey was conducted in which 100 males and, independently, 100 females were asked about their respective methods of transportation to work. Participants were asked whether they typically drive to work, use public transportation, or walk / bicycle. The results are given in the table below. Can the investigators conclude that males differ from females in their work commute tendencies? Show your work. Drive Public Transportation Walk or Bicycle 22 Females 71 Males 76 18 6 (a) Based on the assumption that female and male tendencies are alike, construct a table of expected frequencies. (b) Use a X² test to evaluate the assumption used in part a. Make sure you indicate which test you are using! (c) Interpret the result of part b in terms of the situation of the problem, without using any statistical language.
You have been hired as a consultant by building contractor, who have been sued by the owners' representatives of a large condominium project for shoddy construction work. In order to assess the damages for the various units, the owners' association sent out a letter to owners and asked if people were willing to make their units available for destructive testing. Destructive testing was conducted in some of these units as a result of the responses. Based on the tests, the owners' association inferred the damage over the entire condo complex. Do you think that the inference is valid in this case? a). No, the inference is not valid. It is an example of sample selection bias because owners whose units were relatively more damaged were more likely to make theor units available for destructive testing. b). No, the inference is not valid because not all units were tested. c). Yes, the inference is valid. The study will correctly determine the incidence of damages in the concominium…
CASE 2 (continued) In a completely randomized experimental design, 11 experimental units were used for each of the 3 treatments. Part of the ANOVA table is shown below. ANOVA Source of Variation SS Between Groups Within Groups Total 1500 6000 df I? 32 MS F ? Fill in the blanks in the above ANOVA table.At 95% confidence, test to determine whether or not the means of the 3 populations are equal. Find MSE. MSE is

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