Introductory Statistics (2nd Edition)
2nd Edition
ISBN: 9780321978271
Author: Robert Gould, Colleen N. Ryan
Publisher: PEARSON
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Chapter 6, Problem 66SE
Florida Recidivism Rate The three-year recidivism rate of parolees in Florida is about
a. Find the
b. Find the probability that 6 or fewer out of 20 parolees will and up back in prison within three years.
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30. An individual who has automobile insurance from a certain company is randomly selected. Let Y be the num- ber of moving violations for which the individual was cited during the last 3 years. The pmf of Y isy | 1 2 4 8 16p(y) | .05 .10 .35 .40 .10
a.Compute E(Y).b. Suppose an individual with Y violations incurs a surcharge of $100Y^2. Calculate the expected amount of the surcharge.
24. An insurance company offers its policyholders a num- ber of different premium payment options. For a ran- domly selected policyholder, let X = the number of months between successive payments. The cdf of X is as follows:
F(x)=0.00 : x < 10.30 : 1≤x<30.40 : 3≤ x < 40.45 : 4≤ x <60.60 : 6≤ x < 121.00 : 12≤ x
a. What is the pmf of X?b. Using just the cdf, compute P(3≤ X ≤6) and P(4≤ X).
59. At a certain gas station, 40% of the customers use regular gas (A1), 35% use plus gas (A2), and 25% use premium (A3). Of those customers using regular gas, only 30% fill their tanks (event B). Of those customers using plus, 60% fill their tanks, whereas of those using premium, 50% fill their tanks.a. What is the probability that the next customer will request plus gas and fill the tank (A2 B)?b. What is the probability that the next customer fills the tank?c. If the next customer fills the tank, what is the probability that regular gas is requested? Plus? Premium?
Chapter 6 Solutions
Introductory Statistics (2nd Edition)
Ch. 6 - 6.1-6.4 Directions Determine whether each of the...Ch. 6 - 6.1-6.4 Directions Determine whether each of the...Ch. 6 - 6.1-6.4 Directions Determine whether each of the...Ch. 6 - 6.1-6.4 Directions Determine whether each of the...Ch. 6 - Loaded Die (Example 2) A magician has shaved an...Ch. 6 - Prob. 6SECh. 6 - Distribution of Two Thumbtacks When a certain type...Ch. 6 - Distribution of Two Coin Flips When a fair coin is...Ch. 6 - Two Thumbtacks a. From your answers in Exercise...Ch. 6 - Two Coins a. From your answers in Exercise 6.8,...
Ch. 6 - Snow Depth (Example 3) Eric wants to go skiing...Ch. 6 - Snow Depth Refer to Exercise 6.11. What is the...Ch. 6 - Applying the Empirical Rule with z-Scores The...Ch. 6 - IQs Wechsler IQs are approximately Normally...Ch. 6 - SAT Scores Quantitative SAT scores are...Ch. 6 - Women’s Heights Assume that college women’s...Ch. 6 - Women’s height (Example 4) College women have a...Ch. 6 - Act scores ACT score are approximately Normally...Ch. 6 - Standard Normal Use the table or technology to...Ch. 6 - Standard Normal Use a table or technology to...Ch. 6 - Standard Normal Use a table or technology to...Ch. 6 - Standard Normal Use a table or technology to...Ch. 6 - Extreme Positive z -Scores For each question, find...Ch. 6 - Extreme Negative z-Scores For each question, find...Ch. 6 - Females' SAT Scores (Example 5) According to data...Ch. 6 - Males' SAT Scores According to data from the...Ch. 6 - Stanford-Binet IQs Stanford-Binet IQ scores for...Ch. 6 - Stanford-Binet IQs Stanford-Binet IQs for children...Ch. 6 - Birth Length (Example 6) According to National...Ch. 6 - White Blood Cells The distribution of white blood...Ch. 6 - Red Blood Cells: Men The distribution of red blood...Ch. 6 - Red Blood Cells: Women Answer the previous...Ch. 6 - SAT Scores in Alaska In Alaska in 2010, the...Ch. 6 - SAT Scores in Connecticut In Connecticut in 2010,...Ch. 6 - SAT Scores in New Jersey In New Jersey in 2010,...Ch. 6 - SAT Scores in Texas In Texas in 2010, the average...Ch. 6 - New York City Weather New York City’s mean minimum...Ch. 6 - Women's Heights Assume for this question that...Ch. 6 - Probability or Measurement (Inverse)? (Example 7)...Ch. 6 - Probability or Measurement (Inverse)? The Normal...Ch. 6 - Inverse Normal, Standard In a standard Normal...Ch. 6 - Inverse Normal, Standard In a standard Normal...Ch. 6 - Inverse Normal, Standard Assume a standard Normal...Ch. 6 - Inverse Normal, Standard Assume a standard Normal...Ch. 6 - Females' SAT Scores (Example 8) According to the...Ch. 6 - Males' SAT Scores According to the College Board,...Ch. 6 - Tall Club, Women Suppose there is a club for tall...Ch. 6 - Tall Club, Men Suppose there is a club for tall...Ch. 6 - Women’s Heights Suppose college women’s heights...Ch. 6 - Men’s Heights Suppose college men’s heights are...Ch. 6 - Inverse SATs Critical reading SAT scores are...Ch. 6 - Inverse Women’s Heights College women have heights...Ch. 6 - Girls’ and Women’s Heights According to the...Ch. 6 - Boys’ and Men’s Heights According to the National...Ch. 6 - Cats’ Birth Weights The average birth weight of...Ch. 6 - Elephants’ Birth Weights The average birth weight...Ch. 6 - Gender of Children (Example 10) A married couple...Ch. 6 - Coin Flip A coin will be flipped four times, and...Ch. 6 - Coin Flips (Example 10) A teacher wants to find...Ch. 6 - Twins In Exercise 6.59 you are told to assume that...Ch. 6 - Divorce Suppose that the probability that a...Ch. 6 - Divorce Suppose that the probability that a...Ch. 6 - Identifying n, p, and x (Example 11) For each...Ch. 6 - Identifying n, p, and x For each situation,...Ch. 6 - Stolen Bicycles (Example 12) According to the...Ch. 6 - Florida Recidivism Rate The three-year recidivism...Ch. 6 - Prob. 67SECh. 6 - Cornell Admission The undergraduate admission rate...Ch. 6 - Wisconsin Graduation Wisconsin has the highest...Ch. 6 - Colorado Graduation Colorado has a high school...Ch. 6 - Florida Homicide Clearance The homicide clearance...Ch. 6 - Virginia Homicide Clearance The homicide clearance...Ch. 6 - DWI Convictions (Example 13) In New Mexico, about...Ch. 6 - Internet Access A 2013 Gallup poll indicated that...Ch. 6 - Drunk Walking You may have heard that drunk...Ch. 6 - Texting While Driving According to a Pew poll in...Ch. 6 - Coin Flip (Example 14) A fair coin is flipped 50...Ch. 6 - Drivers Aged 60-65 According to GMAC Insurance, 20...Ch. 6 - Prob. 79SECh. 6 - Prob. 80SECh. 6 - Birth Length A study of U.S. births published on...Ch. 6 - Birth Length A study of U.S. births published on...Ch. 6 - Males’ Body Temperatures A study of human body...Ch. 6 - Females’ Body Temperatures A study of human body...Ch. 6 - Prob. 85CRECh. 6 - Cremation Rates in Mississippi, Binomial and...Ch. 6 - Prob. 87CRECh. 6 - Quantitative SAT Scores, Normal and Binomial The...Ch. 6 - Prob. 89CRECh. 6 - Birth Length and z-Scores, Inverse Babies in the...
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- 38. Possible values of X, the number of components in a system submitted for repair that must be replaced, are 1, 2, 3, and 4 with corresponding probabilities .15, .35, .35, and .15, respectively. a. Calculate E(X) and then E(5 - X).b. Would the repair facility be better off charging a flat fee of $75 or else the amount $[150/(5 - X)]? [Note: It is not generally true that E(c/Y) = c/E(Y).]arrow_forward74. The proportions of blood phenotypes in the U.S. popula- tion are as follows:A B AB O .40 .11 .04 .45 Assuming that the phenotypes of two randomly selected individuals are independent of one another, what is the probability that both phenotypes are O? What is the probability that the phenotypes of two randomly selected individuals match?arrow_forward53. A certain shop repairs both audio and video compo- nents. Let A denote the event that the next component brought in for repair is an audio component, and let B be the event that the next component is a compact disc player (so the event B is contained in A). Suppose that P(A) = .6 and P(B) = .05. What is P(BA)?arrow_forward
- 26. A certain system can experience three different types of defects. Let A;(i = 1,2,3) denote the event that the sys- tem has a defect of type i. Suppose thatP(A1) = .12 P(A) = .07 P(A) = .05P(A, U A2) = .13P(A, U A3) = .14P(A2 U A3) = .10P(A, A2 A3) = .011Rshelfa. What is the probability that the system does not havea type 1 defect?b. What is the probability that the system has both type 1 and type 2 defects?c. What is the probability that the system has both type 1 and type 2 defects but not a type 3 defect? d. What is the probability that the system has at most two of these defects?arrow_forwardThe following are suggested designs for group sequential studies. Using PROCSEQDESIGN, provide the following for the design O’Brien Fleming and Pocock.• The critical boundary values for each analysis of the data• The expected sample sizes at each interim analysisAssume the standardized Z score method for calculating boundaries.Investigators are evaluating the success rate of a novel drug for treating a certain type ofbacterial wound infection. Since no existing treatment exists, they have planned a one-armstudy. They wish to test whether the success rate of the drug is better than 50%, whichthey have defined as the null success rate. Preliminary testing has estimated the successrate of the drug at 55%. The investigators are eager to get the drug into production andwould like to plan for 9 interim analyses (10 analyzes in total) of the data. Assume thesignificance level is 5% and power is 90%.Besides, draw a combined boundary plot (OBF, POC, and HP)arrow_forwardPlease provide the solution for the attached image in detailed.arrow_forward
- 20 km, because GISS Worksheet 10 Jesse runs a small business selling and delivering mealie meal to the spaza shops. He charges a fixed rate of R80, 00 for delivery and then R15, 50 for each packet of mealle meal he delivers. The table below helps him to calculate what to charge his customers. 10 20 30 40 50 Packets of mealie meal (m) Total costs in Rands 80 235 390 545 700 855 (c) 10.1. Define the following terms: 10.1.1. Independent Variables 10.1.2. Dependent Variables 10.2. 10.3. 10.4. 10.5. Determine the independent and dependent variables. Are the variables in this scenario discrete or continuous values? Explain What shape do you expect the graph to be? Why? Draw a graph on the graph provided to represent the information in the table above. TOTAL COST OF PACKETS OF MEALIE MEAL 900 800 700 600 COST (R) 500 400 300 200 100 0 10 20 30 40 60 NUMBER OF PACKETS OF MEALIE MEALarrow_forwardLet X be a random variable with support SX = {−3, 0.5, 3, −2.5, 3.5}. Part ofits probability mass function (PMF) is given bypX(−3) = 0.15, pX(−2.5) = 0.3, pX(3) = 0.2, pX(3.5) = 0.15.(a) Find pX(0.5).(b) Find the cumulative distribution function (CDF), FX(x), of X.1(c) Sketch the graph of FX(x).arrow_forwardA well-known company predominantly makes flat pack furniture for students. Variability with the automated machinery means the wood components are cut with a standard deviation in length of 0.45 mm. After they are cut the components are measured. If their length is more than 1.2 mm from the required length, the components are rejected. a) Calculate the percentage of components that get rejected. b) In a manufacturing run of 1000 units, how many are expected to be rejected? c) The company wishes to install more accurate equipment in order to reduce the rejection rate by one-half, using the same ±1.2mm rejection criterion. Calculate the maximum acceptable standard deviation of the new process.arrow_forward
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