MATH 302 QUIZ 1 – QUESTION AND ANSWERS SET 3 ( LATEST UPDATE )

MATH 302 QUIZ 1 – QUESTION AND ANSWERS SET 3 A Math 302 quiz 1 Question 1 of 20 1.0/ 1.0 Points What is the term for a characteristic or attribute that can assume different values? A.datum B.exponent Correct C.variable D.sample Answer Key: C Question 2 of 20 1.0/ 1.0 Points A pareto chart does NOT have which of the following properties? A.It is used to represent categorical data B.The frequencies are arranged from highest to lowest Correct C.The frequencies are arranged from lowest to highest D.It is a bar chart Answer Key: C Question 3 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 two standard deviations of the mean? A.50% Correct B.95% C.68% D.99.7% Answer Key: B 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. 8% B.95% Correct C.99.7% D.50% Answer Key: C Question 5 of 20 1.0/ 1.0 Points The amount of time needed to run the Boston marathon is an example of which type of variable? Correct A.continuous B. none of the above C.qualitative D.discrete Answer Key: A Question 6 of 20 1.0/ 1.0 Points Gender and State are examples of which type of data? A.Discrete data B.Continuous data C.Ordinal data Correct D.Categorical data Answer Key: D Question 7 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.75 C.60 Correct D.85 Answer Key: D Question 8 of 20 1.0/ 1.0 Points Data that arise from counts are called: A.continuous data B.nominal data C.counted data Correct D.discrete data Answer Key: D Question 9 of 20 1.0/ 1.0 Points Researchers may gain insight into the characteristics of a population by examining a A.mathematical model describing the population B.description of the population C.replica Correct D.sample of the population Answer Key: D Question 10 of 20 0.0/ 1.0 Points What type of graph is the figure below? A.ogive Incorrect B.relative frequency histogram C.pictograph D.Pareto chart Answer Key: D Question 11 of 20 1.0/ 1.0 Points Which of the following statements are false? Correct A.A categorical variable is nominal if there is natural ordering of its possible values. B.A variable is numerical if meaningful arithmetic can be performed on it. C.Zip codes are usually treated as categorical variables, although they appear to be numerical. D.All of the above Answer Key: A Question 12 of 20 1.0/ 1.0 Points For a boxplot, the box itself represents what percent of the observations? Correct A.middle 50% B.lower 25% C.100% D.upper 75% Answer Key: A Part 2 of 3 - 5.0/ 6.0 Points Question 13 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 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 CEOS. Find the mean 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. Correct172.34 CEOS Answer Key: 171.25|173.50 Question 14 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 histogram below represents scores achieved by 250 job applicants on a personality profile. The histogram below represents scores achieved by 250 job applicants on a personality profile. How many job applicants scored between 10 and 30? Place your answer in the blank. Do not use any stray symbols. For example, 123 would be a legitimate answer. Correct100 Answer Key: 100 Question 15 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 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 Compute 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. Correct6.80 Answer Key: 6.71|6.91 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 mean number of children. Place your answer, rounded to two decimal places, in the blank. For example, 3.45 would be a legitimate entry. Correct1.50 Answer Key: 1.90 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 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 mean score on this exam? Place your answer, rounded to two decimal places in the blank. For example, 65.78 would be a legitimate entry. Correct80.40 Answer Key: 80.40 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 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 CEOS. Find the standard deviation 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. Correct43.94 CEOS Answer Key: 42.00|45.00 Part 3 of 3 - 2.0/ 2.0 Points Question 19 of 20 1.0/ 1.0 Points Phone numbers, Social Security numbers, and zip codes are examples of numerical variables Correct True False Answer Key: False Question 20 of 20 1.0/ 1.0 Points The value of the standard deviation always exceeds that of the variance. Correct True False Answer Key: False