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Study Resources (Statistics)

  121) The fact that the direction of an association between two variables can change after we include a third variable and analyze the data at separate levels of that variable is known as ____________________.   121)    ____________ 122) When two explanatory variables are both associated with a response variable but are.
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  101) Referring to Table 19-5, what is the optimal action using the coefficient of variation? 102) Referring to Table 19-5, what is the optimal action using the return to risk ratio? TABLE 19-6   A student wanted to find out the optimal strategy to study for a Business Statistics exam. He constructed the following.
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  44) The data below represent the numbers of absences and the final grades of 15 randomly selected students from a statistics class. Use a scatter plot to display the data. Is there a relationship between the students' absences and their final grades?    44)    _____________ MULTIPLE CHOICE.  Choose the one alternative that.
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  MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question. Answer true or false. 1) The information we gather with experiments and with surveys is collectively called data. 1) _______ A) True B) False   SHORT ANSWER.  Write the word or phrase that best completes each.
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  MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question. Classify as categorical or qualitative data. 1) A survey of automobiles parked in the student and staff lots at a large college recorded the make and model of the automobiles. The variable "make" is: 1).
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  40)   40) ______ A) Linear association, moderately strong association B) Negative association, linear association C) Little or no association D) Moderately strong association, negative association E) Linear association Determine which plot shows the strongest linear correlation. 41)     41) ______ A)   B) C)   D) SHORT ANSWER.  Write.
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  MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question. A sporting goods retailer conducted a customer survey to determine its customers primary reason for shopping at their store. The results are shown in the graph below.     40) What proportion of the customers responded that.
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  SHORT ANSWER.  Write the word or phrase that best completes each statement or answers the question. 31) A sample of recent car buyers was asked to identify what they considered to be the most useful source of information about the cars they purchased.  The results follow.     a.Construct a pie chart for.
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  Select the most appropriate answer. 126) Which of the following numerical summary measures cannot be negative? 126) _____ A) z-score B) standard deviation C) mode D) Q3 E) mean   Determine the quartile, percentile or interquartile range as specified. 127) The test scores of 15 students are listed below. Find the.
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  SHORT ANSWER.  Write the word or phrase that best completes each statement or answers the question. 96) In order to reduce pollutants from motor vehicle exhaust emissions, three-way catalytic converters have been installed in new vehicles.  However, these converters increase the level of ammonia in the air.  A study was.
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    71) Briefly explain why survey data typically consists of data for a sample and not for an entire population. 71) _____________   MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question. 72) If you are interested in creating a data file for a survey you.
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    41) A study attempted to estimate the proportion of Florida residents who were willing to spend more tax dollars on protecting the Florida beaches from environmental disasters. Twenty-four hundred Florida residents were surveyed. Which of the following is the population of interest in the study? 41) ______ A) all Florida.
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  Select the most appropriate answer. 142) In human engineering and product design, it is important to consider the weights of people so that airplanes or elevators aren't overloaded. The weight for adult males in the U.S. follows a bell-shaped distribution with a mean weight of 173 pounds and a standard.
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  28) The enrollment for fall semester at University X is as follows.     a.Construct a bar graph for these data. b.Would a dot plot or a stem-and-leaf plot make sense for these data?  Explain. 28) _____________   MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question. 29) Parking.
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  Provide an appropriate response. 115) The correlation between foot size and vocabulary was found to be quite high for school aged children (grades K-12).   However, once the child's age was accounted for, the correlation between foot size and vocabulary was insignificant.  How can this result be interpreted?   115) _____ A).
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  SHORT ANSWER.  Write the word or phrase that best completes each statement or answers the question. Provide an appropriate response. 137) 1.The data below represent the number of inches of rain in Chicago, Illinois, during the month of April for 20 randomly selected years.   2.47 3.97 3.94 4.11 1.14 4.02 3.41 1.85 5.22 0.97 6.14 2.34 3.48 4.77 2.78 4.00 6.28 5.50 7.69 5.79   a.Construct a box plot for these data. b.Describe.
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  MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question. Complete the contingency table and use it to solve the problem. 20) The partially completed contingency table gives the frequencies of the data on age (in years) and sex from the residents of a retirement.
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  Provide an appropriate response. 30) The relationship between the number of games won by a minor league baseball team and the average attendance at their home games is analyzed. A regression to predict the average attendance from the number of games won has an   Interpret this statistic.   30) ______.
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  MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question. Identify the study as observational or experimental. 1) Twenty volunteers who suffer from sleep apnea are randomly divided in half so that ten receive a new medication to reduce snoring while the remaining ten receive.
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  17) A researcher would like to investigate whether people suffering from insomnia can be helped by taking yoga classes. She designs an experiment as follows. She will obtain a group of volunteers who are suffering from insomnia and who do not currently practice yoga. Each person's degree of insomnia at.
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  SHORT ANSWER.  Write the word or phrase that best completes each statement or answers the question. Provide an appropriate response. 66) The following frequency histogram provides average SO2 (sulfur dioxide) emission rates from utility and industrial boilers (lb/million Btu) for 47 states (data for Idaho, Alaska, and Hawaii omitted).     a.Identify the.
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  SHORT ANSWER.  Write the word or phrase that best completes each statement or answers the question.     61) The basis of ____________________ is that each subject in the population has the same chance of being in the sample. 61) _____________   62) The ____________________ is the set of all subjects of interest;.
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  11) Most patients who undergo surgery make routine recoveries and are discharged as planned, but some patients experience complications and their discharge is delayed. Jamestown has a large hospital and a small hospital, each performing major and minor surgeries. Data is collected at each hospital to see how many surgical.
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    51) A recent poll asked 1,245 registered voters nationwide, "Which party do you think can do a better job of handling immigration issues?" 31% of the respondents answered "Republicans." With a margin of error of ±3%, it is estimated that between 28 and 34 percent of registered voters nationwide feel.
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  MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question. Select the most appropriate answer. 86) Which of the following graphical methods cannot be used to summarize a quantitative dataset? 86) ______ A) a stem-and-leaf plot B) a frequency table C) a dot plot D).
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  MULTIPLE CHOICE.  Choose the one alternative that best completes the statement or answers the question. Provide an appropriate response. 1) Suppose you were to collect data for the pair of given variables in order to make a scatterplot.  For the variables cloudy days and rainy days, which is more naturally.
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