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MATH302 QUIZ 1

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Question;Quiz 1_MATH302;Part 1 of 3 - 11.0/;12.0 Points;Question 1 of 20 1.0/;1.0 Points;Which of the following statistics is not a measure of;central location?;A.Mode;B.Interquartile range;C.Mean;D.Median;Question 2 of 20 1.0/;1.0 Points;Given the following boxplot where m is the median value;what statement could be made about the distribution of the data?;A.No statement can be made about the data;because no data values are shown on the plot.;B.The distribution is negatively skewed.;C.The distribution is positively skewed.;D.The distribution is approximately symmetric.;Question 3 of 20 1.0/;1.0 Points;A histogram that has a single peak and looks approximately;the same to the left and right of the peak is called;A.bimodal;B.balanced;C.symmetric;D.proportional;Question 4 of 20 1.0/;1.0 Points;Suppose that a histogram of a data set is approximately;symmetric and "bell shaped". Approximately, what percent of the;observations are within three standard deviations of the mean?;A.68%;B.95%;C.50%;D.99.7%;Question 5 of 20 1.0/;1.0 Points;The total frequency of the data whose ogive is shown below;is approximately;A.34;B.90;C.18;D.12;Question 6 of 20 1.0/;1.0 Points;Which of the following is the graphical analog of a;frequency table?;A.The contingency table;B.The scatterplot;C.The histogram;D.The time series plot;Question 7 of 20 1.0/;1.0 Points;A pareto chart does NOT have which of the following;properties?;A.It is a bar chart;B.The frequencies are arranged from lowest to;highest;C.It is used to represent categorical data;D.The frequencies are arranged from highest to;lowest;Question 8 of 20 1.0/;1.0 Points;The mode is best described as the;A.middle observation;B.same as the average;C.most frequently occurring value;D.50th percentile;Question 9 of 20 1.0/;1.0 Points;The 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.70;B.85;C.60;D.75;Question 10 of 20 0.0/;1.0 Points;Boxplots are most useful for.;A.comparing the mean to the median;B.comparing two populations graphically;C.calculating the median of the data;D.calculating the mean of the data;Question 11 of 20 1.0/;1.0 Points;Find the z-score for each student and indicate which one has;a better relative position. An Art Major earned a grade of 46 on an exam;with = 50 and s = 5, A Theater Major;earned a grade of 70 on an exam with =;75 and s = 7.;A.Both students have the same score.;B.The higher score cannot be determined.;C.The theater major has a higher relative;position than the art major.;D.The art major has a higher relative position;than the theater major.;Question 12 of 20 1.0/;1.0 Points;If you classified the fruit in a basket as apple, orange, or;banana, this would be an example of which level of measurement?;A.nominal;B.ratio;C.interval;D.ordinal;Part 2 of 3 - 2.0/;6.0 Points;Question 13 of 20 0.0/;1.0 Points;Accepted 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.;125 157 113 127 201;165 145 119 148 158;148 168 117 105 136;136 125 148 108 178;179 191 225 204 104;205 197 119 209 157;209 205 221 178 247;235 217 222 224 187;265 148 165 228 239;245 152 148 115 150;Find the;interquartile range 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. 161.32;CEOSalaries.xls;Question 14 of 20 0.0/;1.0 Points;Accepted 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 on Exam Did Poorly on Exam;Studying for Exam 60 15;Went Partying 22 53;If the sample is a good representation of the population;what percentage of the students in the population should we expect to spend the;weekend studying and do poorly on the final 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;legitimate answer. 25.00;Question 15 of 20 0.0/;1.0 Points;Accepted 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 73;83 84 81 73 75 91 76 77 95 76;90 85 92 84 81 64 75 90 78 78;82 78 86 86 82 70 76 78 72 93;What 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. 80.50;Question 16 of 20 0.0/;1.0 Points;Accepted 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. 2.50;Question 17 of 20 1.0/;1.0 Points;Accepted 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 student scored 84 points on a test where the mean score;was 79 and the standard deviation was 4. Find the student's z score, rounded to;2 decimal places, and place it in the blank.;1.25;An;Question 18 of 20 1.0/;1.0 Points;Accepted 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 mean number of children. Place your answer;rounded to two decimal places, in the blank. For example, 3.45 would be a;legitimate entry. 1.90;Answer Key;Part 3 of 3 - 1.0/;2.0 Points;Question 19 of 20 1.0/;1.0 Points;A 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.;True;False;Question 20 of 20 0.0/;1.0 Points;The number of car insurance policy holders is an example of;a discrete random variable;True;False

 

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