Part 1 of 3 – 9.0/ 12.0 Points Question 1 of 20 1.0/ 1.0 Points For a boxplot, the box itself represents what percent of the observations? A.upper 75% B.lower 25% C.middle 50% D.100% Answer Key: Question 2 of 20 1.0/ 1.0 Points Numerical variables can be subdivided into which two types? A.Cross-sectional and discrete B.Diverse and categorical C.Nominal and progressive D.Discrete and continuous Answer Key: Question 3 of 20 1.0/ 1.0 Points What type of graph is the figure below? A.Pareto chart B.ogive C.relative frequency histogram D.pictograph Answer Key: Question 4 of 20 1.0/ 1.0 Points A histogram that is positively skewed is also called A.balanced B.symmetric C.skewed to the left D.skewed to the right Answer Key: Question 5 of 20 0.0/ 1.0 Points What is the term for a characteristic or attribute that can assume different values? A.variable B.exponent C.sample D.datum Answer Key: Question 6 of 20 1.0/ 1.0 Points The median can also be described as: A.the middle observation when the data values are arranged in ascending orde B.the second quartile C.the 50th percentile D.all of the above Answer Key: Question 7 of 20 1.0/ 1.0 Points The total frequency of the data whose ogive is shown below is approximately A.12 B.18 C.34 D.90 Answer Key: Question 8 of 20 0.0/ 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 one standard deviation of the mean? A.68% B.99.7% C.50% D.95% Answer Key: Comment: Empirical rule Check the video in the forum 1. 1 stdev = 68% 2 stdev 95% 3 stdev = 99.7% Question 9 of 20 1.0/ 1.0 Points Which measure of central location is meaningful when the data are categorical? A.The mode B.The mean C.The median D.The range Answer Key: Question 10 of 20 1.0/ 1.0 Points Since the population is always larger than the sample, the population mean: A.is always larger than or equal to the sample mean B.is always smaller than or equal to the sample mean C.can be smaller than, or larger than, or equal to the sample mean D.is always strictly less than the sample mean Answer Key: Question 11 of 20 0.0/ 1.0 Points The difference between the first and third quartile is called the A.interdependent range B.unimodal range C.interquartile range D.mid range Answer Key: Question 12 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: Part 2 of 3 – 4.0/ 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 histogram below represents scores achieved by 250 job applicants on a personality profile. Sixty percent of the job applicants scored below 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: Comment: count the percentages in the columns .1+0.2+.2+.1 = 0.60 = 60% and this takes us to value 40 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 for…
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