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Study Resources (Statistics)

    123) The following contingency table shows the number of adults with credit scores above and below 725 as well as their marital status.   Credit Score Single (C) Married (D) Below 725 (A) 39 33 725 or above (B) 15 63   Determine whether Events A and C are independent or dependent. What conclusions can be made?   124) According to a Harris Interactive.
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  102) Assume that the flight time for U.S. Airways flight 1267 from Philadelphia to Dallas follows the uniform probability distribution between 210 and 250 minutes. What is the probability that a randomly selected flight will take more than 225 minutes? A) 0.195 B) 0.361 C) 0.625 D) 0.700   103) Assume that the flight time for.
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  46) According to LIMRA, 77% of husband-wife families with kids under 18 years old have life insurance. A random sample of six husband-wife families was selected. What is the mean of this distribution? A) 3.50 B) 4.62 C) 5.28 D) 5.86   47) According to LIMRA, 77% of husband-wife families with kids under 18 years old.
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  69) The ________ is the most commonly used measure of central tendency. A) mean B) median C) mode D) standard deviation 70) When outliers are present in the data set, the ________ is the best choice to measure central tendency. A) mean B) median C) mode D) standard deviation 71) The ________ can found by subtracting the lowest value from.
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    Chapter 4   Introduction to Probabilities   1) A probability is a numerical value that indicates the chance, or likelihood, of a specific event occurring.   2) An event represents all of the possible outcomes of an experiment.   3) An event with a single outcome in its most basic form that cannot be simplified is known.
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    110) A random sample of adults was asked how many books they typically read in a year. The following contingency table shows these results along with their age group.   Number of Books Less than 40 Years Old 40 Years or More None 15 27 1-2 21 30 3-5 24 36 6-10 18 33 11 or more 42 54   The probability that a randomly selected person from this sample typically.
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  117) According to a survey conducted by BIGinsight, women who celebrated Valentine's Day in 2011 spent an average of $86. Assume that this cost is normally distributed with a standard deviation of $27. What is the probability that a randomly selected woman who celebrated Valentine's Day spent between $60 and.
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  36) The following table shows the number of pieces of junk mail that arrives in my mailbox each day.   Number of Pieces of Junk Mail Frequency 2 6 3 10 4 12 5 10 6 2   What is the mean number of pieces of junk mail received per day? A) 2.2 B) 2.5 C) 3.8 D) 4.4   37) The following table shows the number of pieces of junk.
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  52) Costco installs automobile tires on a first-come first-serve basis. The total time a customer needs to wait for the installation to be completed follows the normal distribution with a mean time of 106.3 minutes and a standard deviation of 18.5 minutes. What is the probability that a randomly selected.
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  114) According to the National Work Intensification Survey, 42% of Americans felt their workload in 2011 had significant more responsibility when compared to the start of the recession in December 2007. A random sample of five working Americans was selected. What is the probability that one or two of them.
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  59) The daily high temperature in Philadelphia over an eight-day period is shown below. 6977708184866970 The median for this data set is ________. A) 69 B) 70 C) 73.5 D) 77 60) The ________ is the value that appears most often in a data set. A) mean B) median C) mode D) range 61) The ________ is the best measure of central.
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    70) ________ probability is the probability of Event A occurring without any additional information that could influence the event. A) Posterior B) Conditional C) Subjective D) Prior   71) Dempsey's Garage repairs domestic and import cars. The following table shows the number of cars that have been serviced by age and type during the last month.   Age Domestic Import 0.
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    100) The probability of winning a 5/25 lottery game where 5 numbers are picked from a range of 25 is ________. A) 1/32,852 B) 1/53,130 C) 1/353,775 D) 1/6,375,600   101) A multiple choice test has 12 questions, with each question having five choices. The number of different ways a student can answer the 12 questions.
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  22) Which of the following experiments does not generate a continuous random variable? A) measuring the number of ounces of soda in a bottle B) recording the number of minutes a customer waits on hold for technical support C) counting the number of customers who enter a store during the business day D) recording.
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  138) The time customers spend on the phone with technical support from their Internet provider follows the uniform probability distribution between 8 and 43 minutes. What is the probability that a randomly selected student will spend more than 16 minutes on the phone with technical support?     139) The total time that.
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  112) The average attendance for Division 1 Men's NCAA Basketball games in 2011 was 5,237. Assume that attendance to these games follows the normal probability distribution with a standard deviation of 1,650. What is the probability that a randomly selected game during this year had an attendance more than 3,000?   113).
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  112) According to the National Work Intensification Survey, 42% of Americans felt their workload in 2011 had significant more responsibility when compared to the start of the recession in December 2007. A random sample of five working Americans was selected. What is the probability that none of them felt their.
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    130) A powdered ice tea manufacturer has production facilities in Boston, Atlanta, and Chicago. Boston produces 60% of the company's total output while Atlanta and Chicago each manufacturer 20%. Historically, 2% of the cans of ice tea from the Boston facility have sugar content that is lower than the minimum.
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    50) The ________of Events A and B represents the number of instances in which both Events A and B occur at the same time. A) union B) addition C) complement D) intersection   51) The probability of the intersection of two events is known as a ________ probability. A) marginal B) joint C) simple D) prior   52) The ________ of Events.
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    120) The following contingency table shows the number of adults with credit scores 725 or above and below 725 as well as their marital status.   Credit Score Single (C) Married (D) Below 725 (A) 39 33 725 or above (B) 15 63   Identify the joint probabilities for this table.   121) The following contingency table shows the number of adults with credit.
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  30) The process of measuring or observing an activity for the purpose of collecting data is known as a(n) A) experiment. B) sample space. C) simple event. D) simple probability. 31) ________ probability is used when we know the number of possible outcomes of the event of interest and the total number of possible outcomes.
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    40) A survey asked randomly selected adults 18-29 years old to indicate their working status. The results are shown in the following table.   Working Status Frequency Working full-time 82 Working part-time 48 Student, not working 26 Unemployed 44   The probability that a randomly selected adult 18-29 years old is unemployed is ________. A) 0.09 B) 0.15 C) 0.22 D) 0.30   41) The following table shows the.
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    21) The probability of a binomial distribution represents the variation that we would see in the number of successes over n trials, assuming the chance of a success is p.   22) The number of typographical errors found in a manuscript would best be described using a Poisson probability distribution.   23) The number.
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  92) The shape of the uniform probability distribution is A) symmetrical. B) left-skewed. C) right-skewed. D) flat.   93) The time that customers wait to be served at the delicatessen for a grocery store follows the uniform distribution between 0 and 7 minutes. What is the mean of this distribution? A) 1.5 B) 2.5 C) 3.5 D) 4.5   94) The time.
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    90) A computer system for an organization generates four-letter temporary passwords. The total number of passwords that the system can generate is ________. A) 14,950 B) 358,800 C) 456,976 D) none of the above   91) Craftsman sells 10-digit keypads that are installed on homes to open the garage door. The consumer chooses a 5-number code.
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    60) The following contingency table shows the number of two-bedroom apartments grouped by monthly rent and location.   Monthly Rent York Lancaster Dover $600 to under $700 6 15 9 $700 to under $800 30 21 24 $800 to under $900 15 18 12   The probability that a randomly selected apartment from this group has a monthly rental from $700 to under $800 or is located in Lancaster.
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  106) The following table shows the number of spam e-mails that arrive in my inbox each day.   Number of Spam E-Mails Frequency 3 10 4 29 5 28 6 42 7 16   What is the mean number of spam e-mails received per day? 107) The following table shows the number of spam e-mails that arrive in my inbox each day.   Number of Spam E-Mails Frequency 3 10 4 29 5 28 6 42 7 16   What is.
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  11) The z-score in a normal probability distribution determines the number of standard deviations that a particular value, x, is from the mean.   12) The z-score follows a normal distribution with μ = 1 and σ = 0, which is known as the standard normal distribution.   13) Any normally distributed values can.
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  128) According to Harris Interactive, 35% of college students prefer a digital textbook such as a tablet, e-reader, or computer. A random sample of 150 college students was selected. Using the normal approximation to the binomial distribution, what is the probability that 55, 56, or 57 students from this sample.
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  66) A company that bakes chocolate chip cookies averages 5.2 chocolate chips per cookie. Assume that the number of chocolate chips per cookie follows the Poisson distribution. What is the probability that a randomly selected cookie will contain exactly four chocolate chips? A) 0.1681 B) 0.2254 C) 0.2960 D) 0.3325   67) A company that bakes.
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    11) The mean and standard deviation for discrete probability distributions are useful when comparing two different distributions.   12) Because of the ambiguity of the intervals, technically, it's not proper to calculate the mean and standard deviation of ordinal data. 13) The expected value of sample information is the mean of a discrete.
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    11) A frequency table indicates the number of occurrences of events that are classified according to two categorical variables.   12) Joint probability is another term used for simple probability. 13) The probability of the union of two events occurring can never be more than the probability of the intersection of two events.
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      1) Continuous random variables are outcomes that take on any numerical value in an interval as a result of conducting an experiment.   2) The probability that a continuous random variable equals a specific value is always equal to 1.0.   3) Continuous random variables can take on values between whole integers that contain.
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