MATH 302 QUIZ 1 – QUESTION AND ANSWERS – SET 2 ( LATEST UPDATE )

MATH 302 QUIZ 1 – QUESTION AND ANSWERS – SET 2 MATH302 Quiz 1 Part 1 of 3 - 12.0/ 12.0 Points Question 1 of 20 1.0/ 1.0 Points A histogram that is positively skewed is also called A.symmetric B. skewed to the right C. skewed to the left D. balanced Answer Key: B Question 2 of 20 1.0/ 1.0 Points Researchers may gain insight into the characteristics of a population by examining a A.description of the population B. sample of the population C. mathematical model describing the population D. replica Answer Key: B Question 3 of 20 1.0/ 1.0 Points A variable is classified as ordinal if: A.the data arise from continuous measurements B. there is a natural ordering of categories C. there is no natural ordering of categories D. we track the variable through a period of time Answer Key: B Question 4 of 20 1.0/ 1.0 Points A sample of 20 observations has a standard deviation of 4. The sum of the squared deviations from the sample mean is: A.32 0 B.28 8 C.40 0 D.30 4 Answer Key: D Question 5 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 C. It is a bar chart D. The frequencies are arranged from lowest to highest Answer Key: D Question 6 of 20 1.0/ 1.0 Points What type of graph is the figure below? A. ogive B. relative frequency histogram C. Pareto chart D. pictograph Answer Key: C Question 7 of 20 1.0/ 1.0 Points Numerical variables can be subdivided into which two types? A. Cross-sectional and discrete B. Discrete and continuous C. Nominal and progressive D. Diverse and categorical Answer Key: B Question 8 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.8 5 B.6 0 C.7 5 D.7 0 Answer Key: A Question 9 of 20 1.0/ 1.0 Points Gender and State are examples of which type of data? A.Discrete data B.Ordinal data C.Continuous data D.Categorical data Answer Key: D Question 10 of 20 1.0/ 1.0 Points Which of the following statements is true regarding the data set 10, 10, 10, 10, and 10? A. The range is zero B. The standard deviation equals zero C. The interquartile range equals zero D. all of the above Answer Key: D Question 11 of 20 1.0/ 1.0 Points Which of the following statements is true for the following data values: 7, 5, 6, 4, 7, 8, and 12? A. Only the mean and median are equal B. The mean, median and mode are all equal C. Only the mean and mode are equal D. Only the median and mode are equal Answer Key: B Question 12 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.99.7 % B.68% C.50% D.95% Answer Key: A Part 2 of 3 - 6.0/ 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. 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. 6.71 Answer Key: 6.71| 6.91 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. 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 Exam Did Poorly in Exam Studying for Exam 60 15 Went Partying 22 53 Of 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. 29.33 Answer Key: 29.33 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. The histogram below represents scores achieved by 250 job applicants on a personality profile. Seventy percent of the job applicants scored above what value? Place your answer in the blank. Do not use any stray symbols. For example, 123 would be a legitimate answer. 20 Answer Key: 20 Question 16 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: 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. 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. 100 Answer Key: 100 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 variance of the data. Place your answer, rounded to two decimal places, in the blank. For example, 3.45 would be a legitimate entry. 2.77 Answer Key: 2.77 Part 3 of 3 - 2.0/ 2.0 Points Question 19 of 20 1.0/ 1.0 Points Suppose that a sample of 10 observations has a standard deviation of 3, then the sum of the squared deviations from the sample mean is 30. True Fals e Answer Key: False Question 20 of 20 1.0/ 1.0 Points The number of car insurance policy holders is an example of a discrete random variable True Fals e Answer Key: True