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Study Resources (Statistics)

67.The expected value (mean) of a binomial variable is 15. The number of trials is 20. The probability of "success" is: A..25 B..50 C..75 D..30 68.If 90 percent of automobiles in Orange County have both headlights working, what is the probability that in a sample of eight automobiles, at least seven will have both headlights.
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True / False Questions 1.A random variable is a function or rule that assigns a numerical value to each outcome in the sample space of a stochastic (chance) experiment. 2.A discrete random variable has a countable number of distinct values. Review definition of discrete random variable. But "countable" does not necessarily imply that.
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105.Find the sample correlation coefficient for the following data. A. .8911 B. .9132 C. .9822 D. .9556 106.Heights of male students in a certain statistics class range from Xmin = 61 to Xmax = 79. Applying the Empirical Rule, a reasonable estimate of σ would be: A. 2.75. B. 3.00. C. 3.25. D. 3.50. 107.A reporter for the campus.
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Short Answer Questions 131.In Osaka, Japan, stock brokers earn ×6000 per hour on the average, with a standard deviation of ×1200. In Stuttgart, Germany, stock brokers earn an average of €18 per hour with a standard deviation of €6. In which country is the variation in wages greatest? 132.Find the coefficient of.
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60.Given the contingency table shown here, find P(A or B). A..25 B..85 C..60 D..42 61.Given the contingency table shown here, find P(B | A). A..250 B..555 C..855 D..625 62.Given the contingency table shown here, what is the probability that a randomly chosen employee who is under age 25 would be absent 2 or more days? A..625 B..375 C..150 D..273 63.Oxnard Casualty wants to ensure that.
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21.The gender (M, F) of a randomly chosen unborn child is a Bernoulli event. 22.The Poisson distribution has only one parameter. 23.The standard deviation of a Poisson random variable is the square root of its mean. 24.Customer arrivals per unit of time would tend to follow a binomial distribution. 25.The two outcomes (success, failure).
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115.The following frequency distribution shows the amount earned yesterday by employees of a large Las Vegas casino. Estimate the mean daily earnings. A. $112.50 B. $125.01 C. $105.47 D. $117.13 116.The following table is the frequency distribution of parking fees for a day: A. $7.07. B. $6.95. C. $7.00. D. $7.25. 117.Find the standard deviation of this sample: 4, 7,.
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110.The value of 4P2 is: A.8. B.6. C.24. D.12. 111.The probability that event A occurs, given that event B has occurred, is an example of: A.a marginal probability. B.a conditional probability. C.a joint probability. D.more than one of the above. 112.If each of two independent file servers has a reliability of 93 percent and either alone can run the website,.
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57.The discrete random variable X is the number of students that show up for Professor Smith's office hours on Monday afternoons. The table below shows the probability distribution for X. What is the probability that fewer than 2 students come to office hours on any given Monday? A..10 B..40 C..70 D..90 58.The discrete random variable.
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83.Below is a sorted stem-and-leaf diagram for the measured speeds (miles per hour) of 49 randomly chosen vehicles on highway I-80 in Nebraska. How many vehicles were traveling exactly the speed limit (70 mph)? A. 0 B. 1 C. 19 D. Impossible to tell 84.Below is a sorted stem-and-leaf diagram for the measured speeds (miles.
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65.Which Excel function is designed to calculate z = (x - μ)/σ for a column of data? A. =STANDARDIZE B. =NORM.DIST C. =STDEV.P D. =AVEDEV 66.Which Excel function would be least useful to calculate the quartiles for a column of data? A. =STANDARDIZE B. =PERCENTILE.EXC C. =QUARTILE.EXC D. =RANK 67.A sample of 50 breakfast customers of McDonald's showed.
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85.Which statistics offer robust (resistant to outliers) measures of center? A. Mean, midrange, mode. B. Median, midhinge, trimmed mean. C. Trimmed mean, midrange, midhinge. D. Mean, mode, quartiles. 86.The Empirical Rule says that: A. most business data sets are normally distributed. B. outliers are within three standard deviations of the mean. C. in most business data.
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90.Given the contingency table shown here, find the joint probability that a call sampled at random out of this population is local and 2-5 minutes long. A..5000 B..3125 C..4000 D..4625 91.Given the contingency table shown here, if a call is sampled at random, find the marginal probability that the call is long distance. A..3750 B..6250 C..4000 D.300/500 92.If a call.
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45.In a sample of 10,000 observations from a normal population, how many would you expect to lie beyond three standard deviations of the mean? A. None of them B. About 27 C. About 100 D. About 127 46.The Excel formula for the standard deviation of a sample array named Data is: A. =STDEV.S(Data). B. =STANDEV(Data). C..
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37.In a randomly chosen week, which probability model would you use to describe the number of accidents at the intersection of two streets? A.Binomial B.Poisson C.Hypergeometric D.Geometric 38.Which model best describes the number of nonworking web URLs ("This page cannot be displayed") you encounter in a randomly chosen minute while surfing websites for Florida vacation.
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100.Given the contingency table shown here, find P(G | M). A..1800 B..0450 C..3333 D..1350 101.Given the contingency table shown here, find P(V or S). A..3825 B..4300 C..0475 D..4775 102.Given the contingency table shown here, find P(V | S). A..2639 B..1900 C..0475 D..4144 103.The manager of Ardmore Pharmacy knows that 25 percent of the customers entering the store buy prescription drugs, 65 percent buy over-the-counter drugs,.
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105.Briefly list strengths and weaknesses of this display. Cite specific principles of good graphs, as well as offering your own general interpretation. 106.Briefly list strengths and weaknesses of this display. Cite specific principles of good graphs, as well as offering your own general interpretation. 107.Briefly list strengths and weaknesses of this display..
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53.Pivot tables: A. are similar in purpose to simple 2D pie charts. B. show how the data "pivot" around a point. C. show cross-tabulations of data. D. are not really tables at all. 54.Which of the following is least useful in visualizing categorical data? A. Bar chart B. Pie chart C. Line chart D. Pareto chart 55.Which is.
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50.Given the contingency table shown here, find the probability P(V´), that is, the probability of the complement of V. A..30 B..50 C..80 D..15 51.Given the contingency table shown here, find P(W∩S). A..12 B..30 C..40 D..58 52.Given the contingency table shown here, find P(A or M). A..2500 B..7500 C..6250 D..1250 53.Given the contingency table shown here, find P(A2). A..1842 B..1766 C..8163 D..0578 54.Given the contingency table shown here, find P(A3∩B2). A..3212 B..2933 C..0942 D..1006 55.Given the.
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Short Answer Questions89.Briefly list strengths and weaknesses of this display. Cite specific principles of good graphs, as well as offering your own general interpretation. 90.Briefly list strengths and weaknesses of this display. Cite specific principles of good graphs, as well as offering your own general interpretation. 91.Briefly list strengths and weaknesses of.
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47.Which probability model would you use to describe the number of customers served at a certain California Pizza Kitchen until the first customer orders split pea soup? A.Binomial B.Geometric C.Uniform D.Poisson 48.Which distribution has a mean of 5? A.Poisson with λ = 25 B.Binomial with n = 200, π = .05 C.Hypergeometric with N = 100, n =.
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Multiple Choice Questions 33.The ______________ can be used to differentiate the "vital few" causes of quality problems from the "trivial many" causes of quality problems. A. histogram B. scatter plot C. Pareto chart D. box plot 34.Which is not a characteristic of a dot plot? A. Simplicity B. Legibility C. Wide bins D. Dot stacking 35.Which display is most.
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Multiple Choice Questions 40.Events A and B are mutually exclusive when: A.their joint probability is zero. B.they are independent events. C.P(A)P(B) = 0 D.P(A)P(B) = P(A | B) 41.If two events are complementary, then we know that: A.the sum of their probabilities is one. B.the joint probability of the two events is one. C.their intersection has a nonzero probability. D.they.
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99.Here are advertised prices of 23 used Chevy Impalas. Describe the distribution's shape. Is the number of histogram classes correct? 100.Briefly list strengths and weaknesses of this display. Cite specific principles of good graphs, as well as offering your own general interpretation. 101.Briefly list strengths and weaknesses of this display. Cite specific.
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70.Given the contingency table shown here, what is the probability that a mother in the study smoked during pregnancy? A..2591 B..3174 C..5000 D..7401 71.Given the contingency table shown here, what is the probability that a mother smoked during pregnancy if her education level was below high school? A..2385 B..0907 C..3503 D..3804 72.Given the contingency table shown here, what is the.
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Multiple Choice Questions27.A discrete probability distribution:A.is a listing of all possible values of the random variable. B.assigns a probability to each possible value of the random variable. C.can assume values between -1 and +1. D.is independent of the parameters of the distribution. 28.The number of male babies in a sample of 10 randomly chosen.
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11.The Poisson distribution can be skewed either left or right, depending on λ. 12.Although the shape of the Poisson distribution is positively skewed, it becomes more nearly symmetric as its mean becomes larger. 13.As a rule of thumb, the Poisson distribution can be used to approximate a binomial distribution when n ≥.
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75.The median of 600, 800, 1000, 1200 is: A. 800. B. 1000. C. 900. D. 950. 76.The 25th percentile for waiting time in a doctor's office is 19 minutes. The 75th percentile is 31 minutes. The interquartile range is: A. 12 minutes. B. 16 minutes. C. 22 minutes. D. impossible to determine without knowing n. 77.The 25th percentile.
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120.From the following tree, find the probability that a randomly chosen person will not get a vaccination and will not get the flu. A..18 B..60 C..19 D..70 121.From the following tree, find the probability that a randomly chosen person will get the flu. A..19 B..07 C..81 D..70 122.At Joe's Restaurant, 80 percent of the diners are new customers (N), while.
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94.A study found the following parts per billion of nitrosamines in a sample of domestic beers. (a) Construct a frequency distribution of four classes with equal class sizes. (b) Construct another frequency distribution of four classes using unequal class intervals or an open-ended interval for the highest class. (c) Which.
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Multiple Choice Questions35.The coefficient of variation is A. measured on a scale from 0 to 100. B. a unit-free statistic. C. helpful when the sample means are zero. D. a measure of correlation for two variables. 36.Which is not an advantage of the method of medians to find Q1 and Q3? A. Ease of.
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80.Given the contingency table shown here, if a randomly chosen student attends a religious school, what is the probability the location is rural? A..142 B..162 C..167 D..333 81.Given the contingency table shown here, if a randomly chosen student attends school in an inner-city location, what is the probability that it is a public school? A..189 B..333 C..500 D..567 82.Given the.
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Short Answer Questions 124.Axolotl, Inc. decided to double the number of independent network file servers, each server being capable of running its entire internal corporate network. Bob suggested that "doubling the number of file servers in our corporate network will just double the chances of failure." Is Bob right? Has the.
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