MATH 302 - (MATH 302) Quiz 1. Latest. Questions and Answers.

MATH 302 - (MATH 302) Quiz 1. Latest. Questions and Answers. QUIZ 1 Question 1 of 20 1.0/ 1.0 Points Which of the following statements are false regarding a boxplot? A.The height of the box has no significance. B.Boxplots can be used to either describe a single variable in a data set or to compare two (or more) variables C.The length of the box equals the range of the data. D.The right and left of the box are the third and first quartiles Answer Key: C Question 2 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.balanced B.symmetric C.proportional D.bimodal Answer Key: B Question 3 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 two standard deviations of the mean? A.95% B.50% C.68% D.99.7% Answer Key: A Question 4 of 20 1.0/ 1.0 Points A population includes: A.only machines B.only households C.only people D.all objects of interest in a particular study Answer Key: D 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? A.discrete B.continuous C.none of the above D.qualitative Answer Key: B Question 6 of 20 1.0/ 1.0 Points Researchers may gain insight into the characteristics of a population by examining a A.sample of the population B.replica C.mathematical model describing the population D.description of the population Answer Key: A Question 7 of 20 1.0/ 1.0 Points If a variable has possible values –2, 6, and 17, then this variable is A.both a continuous and a discrete variable B.neither a continuous nor a discrete variable C.a continuous variable D.a discrete variable Answer Key: D Question 8 of 20 1.0/ 1.0 Points The total frequency of the data whose ogive is shown below is approximately A.12 B.90 C.18 D.34 Answer Key: D Question 9 of 20 1.0/ 1.0 Points Data that arise from counts are called: A.counted data B.discrete data C.nominal data D.continuous data Answer Key: B Question 10 of 20 1.0/ 1.0 Points The length of the box in the boxplot portrays the A.median B.interquartile range C.mean D.range Answer Key: B Question 11 of 20 1.0/ 1.0 Points Which measure of central location is meaningful when the data are categorical? A.The range B.The mean C.The mode D.The median Answer Key: C Question 12 of 20 1.0/ 1.0 Points A scatter plot would be useful for A.Showing the trend of sales, over time, of five different brands of blank DVDs B.Showing the top selling brands of blank DVDs C.Showing the relative number of sales of four different brands of blank DVDs D.Showing the relationship between the sales of blank CDs and blank DVDs Answer Key: D