Exam 3: Probability

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: In a recent survey about US policy in Iraq,62 % of the respondents said that they support US policy in Iraq.Females comprised 53% of the sample,and of the females,46% supported US policy in Iraq.A person is selected at random. -What is the probability that the person we select is male?

Which of the following is true?

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: In a recent survey about capital punishment,64% of the respondents said that they support capital punishment.Females comprised 48% of the sample,and of the females,46% supported capital punishment. -Suppose we select a person who does not support capital punishment,what is the probability that the person is male?

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: In a recent survey about US policy in Iraq,62 % of the respondents said that they support US policy in Iraq.Females comprised 53% of the sample,and of the females,46% supported US policy in Iraq.A person is selected at random. -What is the probability that the person we select does not support US policy in Iraq?

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: A personnel officer for a firm that employs many part time salespeople tries out a sales aptitude test on several hundred applicants.Because the test is unproven,results are not used in hiring.Forty percent of applicants show high aptitude on the test and 12% of those hired both show high and achieve good sales records.The firm's experience shows that 30% of all salespeople achieve good sales.Let A be the event "shows high aptitude" and let B be the event "achieves good sales". -What is P(B |A)?

Which of the following statements is true for any two events A and B defined on a sample space S?

Are the events "had a college education" and "had high confidence" statistically independent?

Subjective probabilities are useful in certain management decision procedures because they express an individual's degree of belief about the chance that an event will occur.

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: A recent survey showed that 15% of computer programmers have experienced some form of wrist pain from typing,and that 25% are taking aspirin daily.Six percent of all programmers have both experienced some form of wrist pain from typing and taken aspirin on a daily basis. -What is the probability that a programmer does not have wrist pain and does not take aspirin on a daily basis?

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: A market research firm regularly assembles panel of consumers to test new television commercials for effectiveness.The consumers are told that they are evaluating a pilot TV program.After viewing the hour-long program,complete with commercials,they are asked many questions about the program and some about the commercial - the actual object of research.A tabulation of results from one panel counted the number of panelists who recalled the product incorrectly,the number who recalled the product correctly and had a favorable opinion,and the number who recalled the product correctly and had an unfavorable opinion. -Use the addition rule to find the probability that a randomly chosen consumer recalled the commercial.

Consider two events A and B.Which of the following statements is true?

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: A manufacturer of automobiles conducted a market survey.Eighty percent of the customers want better fuel efficiency,while 55% want a vehicle navigation system and 45% percent want both features. -The probability that a person wants neither better fuel efficiency nor a vehicle navigation system is:

Suppose a student signed up for three courses next semester,all of which are taught by professors with good evaluations.What is the probability he enjoys all three?

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: A recent marketing survey tried to relate a consumer's awareness of a new marketing campaign with their rating of the product.Consumers rated their awareness as low,medium,or high,and rated the product as poor,fair,or good.The results are presented below. -What is the probability that a consumer who did not rank the product as poor had high awareness?

A Venn diagram provides an intuitive understanding of the addition rule.

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: A supplier is evaluating a firm to manufacture a subassembly.Quality data from past inspections reveal the following probabilities for number of defective parts in a shipment: -What is the probability that the shipment will have at least two defective parts?

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: Consider a sample space defined by events A₁,A₂,B₁,B₂.Let P(A₁)= 0.40 ,P(B₁ ∣ A₁)= 0.60 and P(B₁ ∣ A₂)= 0.70 -What is P(B₂)?

The set of all possible outcomes from a random experiment is called the sample:

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: A manufacturer of automobiles conducted a market survey.Eighty percent of the customers want better fuel efficiency,while 55% want a vehicle navigation system and 45% percent want both features. -The probability that a person wants a vehicle navigation system but not better fuel efficiency is:

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: In a recent survey of consumer confidence,160 respondents were classified by their level of education.The results of the survey are presented below. -What is the proportion of respondents who had medium or high confidence?