Introductory Statistics (2nd Edition)
2nd Edition
ISBN: 9780321978271
Author: Robert Gould, Colleen N. Ryan
Publisher: PEARSON
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Chapter 7, Problem 15SE
Questionnaire Response (Example 3) A teacher at a community college sent out questionnaires to evaluate how well the administrators were doing their jobs. All teachers received questionnaires, but only
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17. Suppose that X1, X2,..., Xn are random variables, such that E|xk| < ∞ for
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6. Show that, for any random variable, X, and a > 0,
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P(x < X ≤ x+a) dx = a.
2015
15. This problem extends Problem 20.6. Let X, Y be random variables with finite
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(P(X ≤ x ≤ Y) - P(Y < x ≤ X))dx = E Y — E X.
Chapter 7 Solutions
Introductory Statistics (2nd Edition)
Ch. 7 - Parameter vs. Statistic (Example 1) Explain the...Ch. 7 - Sample vs. Census Explain the difference between a...Ch. 7 - x vs. Two symbols are used for the mean: and x....Ch. 7 - xvs. The mean GPA of all 5000 students at Uneeda...Ch. 7 - Ages of Presidents Suppose you knew the age at...Ch. 7 - Heights of Basketball Team Suppose you find all...Ch. 7 - Sample vs. Census You are receiving a large...Ch. 7 - Sampling GPAs Suppose you want to estimate the...Ch. 7 - Sampling with and without Replacement Explain the...Ch. 7 - Simple Random Sampling Is simple random sampling...
Ch. 7 - Finding a Random Sample (Example 5) You need to...Ch. 7 - Finding a Random Sample You need to select a...Ch. 7 - Random Sampling Assume your class has 30 students...Ch. 7 - Random Sampling with Coins Assume your class has...Ch. 7 - Questionnaire Response (Example 3) A teacher at a...Ch. 7 - Survey on Social Security A phone survey asked...Ch. 7 - Views on Capital Punishment In carrying out a...Ch. 7 - Views on Capital Punishment Use the data given in...Ch. 7 - Targets: Bias or Lack of Precision? a. If a...Ch. 7 - Targets: Bias or Lack of Precision, Again a. If a...Ch. 7 - Bias? Suppose that, when taking a random sample of...Ch. 7 - Unbiased Sample? Suppose you attend a school that...Ch. 7 - Proportion of Odd Digits A large collection of...Ch. 7 - Proportion of Odd Digits...Ch. 7 - Prob. 25SECh. 7 - Prob. 26SECh. 7 - ESP A Zener deck of cards has cards that show one...Ch. 7 - ESP Again In the graphs for Exercise 7.33, explain...Ch. 7 - Standard Error Which of the dotplots given in...Ch. 7 - Bias? Assuming that the true proportion of success...Ch. 7 - Fair Coin? One of the graphs shows the proportion...Ch. 7 - Far from Fair Which of the graphs in Exercise 7.37...Ch. 7 - What Is the Proportion of Seniors? (Example 5) A...Ch. 7 - Simulation From a very large (essentially...Ch. 7 - MMs (Example 5) Return to Exercise 7.25 and find...Ch. 7 - Random Letters Return to Exercise 7.26 and find...Ch. 7 - Jury Selection (Example 6) Juries should have the...Ch. 7 - Mercury in Freshwater Fish According to an article...Ch. 7 - The Oregon Bar Exam (Example 7) According to the...Ch. 7 - Feeding Vegans A survey of eating habits showed...Ch. 7 - Overweight Children The Ventura County Star (June...Ch. 7 - Living in Poverty The Ventura County Star article...Ch. 7 - Passing a Test by Guessing A true/false test has...Ch. 7 - Gender: Randomly Chosen? A large community college...Ch. 7 - Prob. 45SECh. 7 - Is Marriage Becoming Obsolete? When asked whether...Ch. 7 - East Germany According to a Gallup Poll taken in...Ch. 7 - View of Immigration In June 2012, a Gallup Poll...Ch. 7 - Voting A random sample of likely voters showed...Ch. 7 - Voting A random sample of likely voters showed...Ch. 7 - High School Diplomas (Example 8) In a simple...Ch. 7 - Diabetes In a simple random sample of 1200...Ch. 7 - Confidence in Public Schools A 2012 Gallup Poll...Ch. 7 - Confidence in the Military In June 2012, a Gallup...Ch. 7 - Thriving In June 2012, a Gallup Poll showed that...Ch. 7 - Benefits of Rich Class In May 2012, a Gallup Poll...Ch. 7 - Understanding the Meaning of Confidence Levels: 90...Ch. 7 - Understanding the Meaning of Confidence Levels: 80...Ch. 7 - Past Presidential Vote In the 1960 presidential...Ch. 7 - Human Cloning In a Gallup Poll, 441 of 507 adults...Ch. 7 - Do People Think Astrology Is Scientific? (Example...Ch. 7 - Do People Think the Sun Goes around the Earth? In...Ch. 7 - Good News on Jobs The Pew Research Center reports...Ch. 7 - Obesity In a 2013 Pew Poll, 36#37; of Republicans...Ch. 7 - Stressed Moms (Example 11, 12, 13, and 14) An...Ch. 7 - Gay Marriage According to the Pew Research Center,...Ch. 7 - Perry Preschool and Graduation from High School...Ch. 7 - Preschool: Just the Boys Refer to Exercise 7.77...Ch. 7 - Antibiotics for Malnutrition (Example 15) A study...Ch. 7 - Transfusions for Bleeding in the Stomach Should...Ch. 7 - Gender and Use of Turn Signals Statistics student...Ch. 7 - Diet Drug (Meridia) A randomized,...Ch. 7 - Drug for Nausea Ondansetron (Zofran) is a drug...Ch. 7 - Preschool: Just the Girls The Perry Preschool...Ch. 7 - Banning Super-Size Sugary Drinks A June 2012...Ch. 7 - Banning Smoking A July 2011 Roper Poll showed that...Ch. 7 - Sample Proportion A poll on a proposition showed...Ch. 7 - Sample Proportion A poll on a proposition showed...Ch. 7 - Margin of Error A poll on a proposition showed...Ch. 7 - Margin of Error A poll on a proposition showed...Ch. 7 - Prob. 81CRECh. 7 - Prob. 82CRECh. 7 - Dreaming in Color According to studies done in the...Ch. 7 - Hand Washing Ignaz Semmelweiss (1818-1865) was the...Ch. 7 - Romney vs. Santorum During the Republican primary...Ch. 7 - Sampling Error In March 2012, President Obama's...Ch. 7 - Young Women's Career Goals Are the career goals of...Ch. 7 - Young Men's Career Goals Are the career goals of...Ch. 7 - Voters Poll: Sample Size A polling agency wants to...Ch. 7 - Ratio of Sample Sizes Find the sample size...Ch. 7 - Criticize the Sampling Marco is interested in...Ch. 7 - Criticize the Sampling Maria opposes capital...Ch. 7 - Random Sampling? If you walked around your school...Ch. 7 - Biased Sample? You want to find the mean weight of...Ch. 7 - Bias? Suppose that, when taking a random sample of...Ch. 7 - Bias? Four women selected from a photo of 123 were...
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- 2. Which of the following statements are (not) true? lim sup{An U Bn} 818 lim sup{A, B} 818 lim inf{An U Bn} 818 818 lim inf{A, B} An An A, Bn- A, BnB →B = = = lim sup A, U lim sup Bn; 818 818 lim sup A, lim sup Bn; 818 81U lim inf A, U lim inf Bn; 818 818 lim inf A, lim inf Bn; n→X 818 An U BRAUB as no; An OBRANB as n→∞.arrow_forwardThroughout, A, B, (An, n≥ 1), and (Bn, n≥ 1) are subsets of 2. 1. Show that AAB (ANB) U (BA) = (AUB) (AB), Α' Δ Β = Α Δ Β, {A₁ U A2} A {B₁ U B2) C (A1 A B₁}U{A2 A B2).arrow_forward16. Show that, if X and Y are independent random variables, such that E|X|< ∞, and B is an arbitrary Borel set, then EXI{Y B} = EX P(YE B).arrow_forward
- Proposition 1.1 Suppose that X1, X2,... are random variables. The following quantities are random variables: (a) max{X1, X2) and min(X1, X2); (b) sup, Xn and inf, Xn; (c) lim sup∞ X and lim inf∞ Xn- (d) If Xn(w) converges for (almost) every w as n→ ∞, then lim- random variable. → Xn is aarrow_forwardExercise 4.2 Prove that, if A and B are independent, then so are A and B, Ac and B, and A and B.arrow_forward8. Show that, if {Xn, n ≥ 1) are independent random variables, then sup X A) < ∞ for some A.arrow_forward
- 8- 6. Show that, for any random variable, X, and a > 0, 8 心 P(xarrow_forward15. This problem extends Problem 20.6. Let X, Y be random variables with finite mean. Show that 00 (P(X ≤ x ≤ Y) - P(X ≤ x ≤ X))dx = E Y — E X.arrow_forward(b) Define a simple random variable. Provide an example.arrow_forward17. (a) Define the distribution of a random variable X. (b) Define the distribution function of a random variable X. (c) State the properties of a distribution function. (d) Explain the difference between the distribution and the distribution function of X.arrow_forward16. (a) Show that IA(w) is a random variable if and only if A E Farrow_forward15. Let 2 {1, 2,..., 6} and Fo({1, 2, 3, 4), (3, 4, 5, 6}). (a) Is the function X (w) = 21(3, 4) (w)+711.2,5,6) (w) a random variable? Explain. (b) Provide a function from 2 to R that is not a random variable with respect to (N, F). (c) Write the distribution of X. (d) Write and plot the distribution function of X.arrow_forwardarrow_back_iosSEE MORE QUESTIONSarrow_forward_ios
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