Statistics Expert Answers / Study Resources : Page 128

63.Which is not a characteristic of using a log scale to display time series data? A. A log scale helps if we are comparing changes in two time series of dissimilar magnitude. B. General business audiences find it easier to interpret a log scale. C. If you display data on a log.

136.Patient waiting times in the Tardis Orthopedic Clinic have a mean of 50 minutes with a standard deviation of 25 minutes. Within what range would approximately 95 percent of the waiting times lie if we were sampling a normal distribution? Do you think the distribution is likely to be normal?.

100.Which is a discrete variable? A. The time it takes to put on a pair of jeans B. The price you paid for your last pair of jeans C. The distance to the store where you purchased your last pair of jeans D. The number of pairs of jeans that you own 101.A section.

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 ≥.

21.Referring to this box plot of ice cream fat content, the mean would exceed the median. 22.Referring to this box plot of ice cream fat content, the skewness would be negative. 23.Referring to this graph of ice cream fat content, the second quartile is about 61. 24.The range as a measure of variability.

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).

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..

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..

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,.

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.

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.

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.

True / False Questions 1.A data set with two values that are tied for the highest number of occurrences is called bimodal. 2.The midrange is not greatly affected by outliers. 3.The second quartile is the same as the median. 4.A trimmed mean may be preferable to a mean when a data.

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.

11.The midhinge is a robust measure of center when there are outliers. 12.Chebyshev's Theorem says that at most 50 percent of the data lie within 2 standard deviations of the mean. 13.Chebyshev's Theorem says that at least 95 percent of the data lie within 2 standard deviations of the mean..

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.

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.

Short Answer Questions108.Which survey method would you recommend to survey opinions of airline passengers about the cleanliness of the restrooms in the Detroit airport? Why not the others? 109.What kind of sampling method would you suggest in order to tabulate the number of formulas on a typical page of the.

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.

95.Twelve randomly chosen students were asked how many times they had missed class during a certain semester, with this result: 3, 2, 1, 2, 1, 5, 9, 1, 2, 3, 3, 10. The median is: A. 7.0. B. 3.0. C. 3.5. D. 2.5. 96.One disadvantage of the range is that: A. only extreme values.

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.

True / False Questions 1.It is easier to read the data values on a 3D column chart than on a 2D column chart. 2.The column chart should be avoided if you are plotting time series data. 3.The line chart is appropriate for categorical (qualitative) data. 4.The Pareto chart is used to.

146.Below are shown a dot plot and summary statistics for a random sample of 34 shower heads. The measurements are maximum flow rates (in gallons per minute) at pressure of 80 pounds per square inch. Use the data to illustrate the difference between the two alternative definitions of "outlier," and.

True / False Questions 1.A sample space is the set of all possible outcomes in an experiment. 2.The sum of all the probabilities of simple events in a sample space equals one. 3.The sum of the probabilities of all compound events in a sample space equals one. 4.Probability is the measure.

11.Sturges' Rule should override judgment about the "right" number of histogram bins. 12.Sturges' Rule is merely a suggestion, not an ironclad requirement. 13.Excel's 3D pie charts are usually clearer than 2D pie charts. 14.A common error with pie charts is using too few "slices." 15.A pie chart can generally be.

55.Exam scores in a small class were 0, 50, 50, 70, 70, 80, 90, 90, 100, 100. For this data set, which statement is incorrect concerning measures of center? A. The median is 70. B. The mode is not helpful. C. The geometric mean is useless. D. The mean is 70. 56.Exam scores in.

31.When two events A and B are independent, the probability of their intersection can be found by multiplying their probabilities. 32.Two events are mutually exclusive when they contain no outcomes in common. 33.In a contingency table, the probability of the union of two events is found by taking the frequency.

73.When using a dot plot with a small sample, which is least apparent? A. Dispersion of data values within the array B. The overall shape of the distribution C. Central tendency of data in the data set D. Location of data values within the array 74.If you have 256 data points, how many classes.

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.

21.The zero origin rule may be waived for column or line charts if the objective is merely to visualize relative change over time. 22.In a bimodal histogram, the two highest bars will have the same height. 23.A frequency distribution is a tabulation of n data values into classes called bins..

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.

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.

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.

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.

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.

21.If A and B are mutually exclusive events, then P(A∩B) = P(A) + P(B). 22.The probability of A and its complement (A´) will always sum to one. 23.If event A occurs, then its complement (A´) will also occur. 24.The sum of the probabilities of two mutually exclusive events is one..

141.The owner of a chicken farm kept track of each hen's eating and egg production for many months, with the results below. Which has more variation, feed consumption or egg output? 142.Below are the ages of 21 CEOs. Find the mean, median, and mode. Are there any outliers? Explain.46, 48, 49,.

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.

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,.

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.

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.

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,.

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.

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.

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.

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.

43.Which is a reason for using a log scale for time series data? A. It helps compare growth in time series of dissimilar magnitude. B. General business audiences find it easier to interpret a log scale. C. On a log scale, equal distances represent equal dollar amounts. D. The axis labels are usually.

125.Which of the following statements is likely to apply to the incomes of 50 randomly chosen taxpayers in California? A. The median income would probably be near the mean. B. The midhinge would be a robust measure of center. C. The sum of squared deviations about the mean would be negative. D. Outliers.

11.Events A and B are mutually exclusive if P(A∩B) = 0. 12.Independent events are mutually exclusive. 13.If events A and B are mutually exclusive, then P(A) + P(B) = 0. 14.P(A | B) is the joint probability of events A and B divided by the probability of A. 15.Two events.

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.