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Math302 quiz 1

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Question;Question 1 of 201.0 PointsWhich of the following statements is true regarding the data set 10, 10, 10, 10, and 10?A.The range is zeroB.The standard deviation equals zeroC.The interquartile range equals zeroD.all of the aboveReset SelectionQuestion 2 of 201.0 PointsWhich of the following are the two most commonly used measures of variability?A.Variance and medianB.Mean and varianceC.Variance and standard deviationD.Range and interquartile rangeReset SelectionQuestion 3 of 201.0 PointsWhich of the following statements are false regarding a boxplot?A.Boxplots can be used to either describe a single variable in a data set or to compare two (or more) variablesB.The right and left of the box are the third and first quartilesC.The height of the box has no significance.D.The length of the box equals the range of the data.Reset SelectionQuestion 4 of 201.0 PointsThe average score for a class of 30 students was 75. The 20 male students in the class averaged 70. The 10 female students in the class averaged:A.70B.85C.75D.60Reset SelectionQuestion 5 of 201.0 PointsWhich of the following could be a cumulative frequency graph?A.B.C.D.Reset SelectionQuestion 6 of 201.0 PointsWhich of the following is the graphical analog of a frequency table?A.The scatterplotB.The contingency tableC.The time series plotD.The histogramReset SelectionQuestion 7 of 201.0 PointsData that arise from counts are called:A.counted dataB.continuous dataC.discrete dataD.nominal dataReset SelectionQuestion 8 of 201.0 PointsFor a boxplot, the box itself represents what percent of the observations?A.100%B.middle 50%C.upper 75%D.lower 25%Reset SelectionQuestion 9 of 201.0 PointsThe amount of time needed to run the Boston marathon is an example of which type of variable?A.continuousB.discreteC.qualitativeD.none of the aboveReset SelectionQuestion 10 of 201.0 PointsThe mode is best described as theA.middle observationB.50th percentileC.most frequently occurring valueD.same as the averageReset SelectionQuestion 11 of 201.0 PointsA population includes:A.only householdsB.only machinesC.only peopleD.all objects of interest in a particular studyReset SelectionQuestion 12 of 201.0 PointsWhat type of graph is the figure below?A.ogiveB.Pareto chartC.relative frequency histogramD.pictographReset SelectionPart 2 of 3 -Question 13 of 201.0 PointsAccepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation).NOTE:For scientific notation, a period MUST be used as the decimal point marker.Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.A statistics professor has just given a final examination in his statistical inference course. He is particularly interested in learning how his class of 40 students performed on this exam. The scores are shown below. 77 81 74 77 79 73 80 85 86 7383 84 81 73 75 91 76 77 95 7690 85 92 84 81 64 75 90 78 7882 78 86 86 82 70 76 78 72 93Compute the standard deviation of these test scores. Place your answer, rounded to 2 decimal places in the blank. For example, 5.34 would be a legitimate entry. Question 14 of 201.0 PointsAccepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation).NOTE:For scientific notation, a period MUST be used as the decimal point marker.Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.The following data represent the number of children in a sample of 10 families from Chicago: 4, 2, 1, 1, 5, 3, 0, 1, 0, and 2.Compute the median number of children. Place your answer, rounded to two decimal places, in the blank. For example, 3.45 would be a legitimate entry.Question 15 of 201.0 PointsAccepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation).NOTE:For scientific notation, a period MUST be used as the decimal point marker.Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.The following data are the base salaries,in thousands of dollars, of 50 chief executive officers for a sample of companies doing business with the state of Connecticut. That is, the first entry in the table below corresponds to a salary of $125,000. A copy of this data set can be found in the Excel Workbook called CEOSalaries.xls.125157113127201165145119148158148168117105136136125148108178179191225204104205197119209157209205221178247235217222224187265148165228239245152148115150 Find the median of the CEO salaries, in thousands of dollars, rounded to 2 decimal places. Do not use a dollar sign. Note: $177,760 should be recorded as 177.76.CEOSalaries.xlsQuestion 16 of 201.0 PointsAccepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation).NOTE:For scientific notation, a period MUST be used as the decimal point marker.Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.A statistics professor has just given a final examination in his statistical inference course. He is particularly interested in learning how his class of 40 students performed on this exam. The scores are shown below.77 81 74 77 79 73 80 85 86 7383 84 81 73 75 91 76 77 95 7690 85 92 84 81 64 75 90 78 7882 78 86 86 82 70 76 78 72 93What is the median score on this exam? Place your answer, rounded to two decimal places in the blank. For example, 65.78 would be a legitimate entry.Question 17 of 201.0 PointsAccepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation).NOTE:For scientific notation, a period MUST be used as the decimal point marker.Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.The following data represent the number of children in a sample of 10 families from Chicago: 4, 2, 1, 1, 5, 3, 0, 1, 0, and 2.Compute the variance of the data. Place your answer, rounded to two decimal places, in the blank. For example, 3.45 would be a legitimate entry.Question 18 of 201.0 PointsAccepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation).NOTE:For scientific notation, a period MUST be used as the decimal point marker.Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values.For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.A sample of 150 students at a State University was taken after the final business statistics exam to ask them whether they went partying the weekend before the final or spent the weekend studying, and whether they did well or poorly on the final. The following table contains the result.Did Well in ExamDid Poorly in ExamStudying for Exam6015Went Partying2253Of those in the sample who went partying the weekend before the final exam, what percentage of them did well in the exam? Place your answer in the blank, rounded to 2 decimal places. Do not use a percentage sign (%). For example, 44.44 would be a legitmate answer. Part 3 of 3 -Question 19 of 201.0 PointsIf two data sets have the same range, the smallest and largest observations in both sets should be the sameTrueFalseReset SelectionQuestion 20 of 201.0 PointsA histogram is skewed to the right (or positively skewed) if it has a single peak and the values of the distribution extend much further to the left of the peak than to the right of the peak.TrueFalseReset Selection

 

Paper#61122 | Written in 18-Jul-2015

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