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##### ECONOMICS QUIZ

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solution

**Question**

Question;1. The stemplot below displays midterm exam scores for the 34;students taking a Calculus course. The highest possible test score was 100. The;teacher declared that an exam grade of 65 or higher was good enough for a grade;of ?C? or better.;Reference: Ref 1-5;This stemplot is most similar to;A. reporting the five-point summary for the data, with the mean.;B. a histogram with class intervals 30 score < 40, 40 score;< 50, etc.;C. a time plot of the data with the observations taken in;increasing order.;D. a;boxplot of the data.;2 The;exam scores (out of 100 points) for all students taking an introductory;Statistics course are used to construct the following boxplot.;Reference: Ref 2-3;About 25% of the students scores;exceeded;A. 75.;B. 85.;C. 60.;D. 50.;3. A locomotive's ?adhesion? is the locomotive's pulling force;as a multiple of its weight. This is an important performance measure of a;locomotive. A diesel locomotive model has adhesion which varies in actual use;according to a Normal distribution with mean 0.37 and standard deviation 0.04.;The first quartile of the;distribution of adhesion used is;A. 0.29.;B. 0.34.;C. 0.25.;D. 0.04.;4. The histogram below shows the average property damage in;millions of dollars caused by tornadoes over a 50-year period in each of the;states and Puerto Rico.;Reference: Ref 2-6;From the histogram, which of the;following is true?;A. The mean is larger than the median.;B. It is impossible to compare the mean and median for these;data.;C. The mean is smaller than the median.;D. The;mean and median are approximately equal.;5. The histogram below shows the time visitors to a museum;spent browsing an exhibit on a Saturday. There were 300 visitors that day. The;following histogram is of the data collected.;Reference: Ref 1-3;The percent of visitors spending;more than 85 minutes at the museum is closest to;A. about 5%.;B. about 30%.;C. over 40%.;D. about 20%.;6 Scores;on the SAT verbal test in recent years follow approximately the N(515, 109) distribution.;How low must a student score to;place in the bottom 5% of all students taking the SAT?;A. 301;B. 729;C. 336;D. 694;7. A company has three divisions and three conference rooms for;meetings. To keep track of the use of their facilities, for each meeting held;in the company, the division holding the meeting is recorded, the room for the;meeting is recorded, and the length of time of the meeting is recorded. Which;of the variables is quantitative?;A. the division holding the meeting;B. the conference room for the meeting;C. the length of time for the meeting;D. All of the above;8. A violin student records the number of hours she spends;practicing during each of nine consecutive weeks.;6.2;5.0;4.3;7.4;5.8;7.2;8.4;1.2;6.3;Reference: Ref 2-1;Considering the smallest data;value (1.2) and using the 1.5 ? IQR rule, we would;A. classify the value 1.2 as an outlier because it is more than;1.5 ? IQR's below the median.;B. classify the value 1.2 as an outlier, because it is more than;1.5 ? IQR's below the first quartile.;C. not classify the value 1.2 as an outlier because it is not;more than 1.5 ? IQR's below the first quartile.;D. classify the value 1.2 as an outlier because it is more than;1.5 ? IQR's below the mean.;9. A sample was taken of the salaries of 20 employees of a;large company. The following is a boxplot of the salaries (in thousands of;dollars) for this year.;Reference: Ref 2-5;Based on this boxplot, the;five-number summary (in thousands of dollars) is;A. 28, 39, 48, 60.5, 77.;B. 28, 41, 51, 60.5, 77.;C. 28, 39, 51, 58, 77.;D. 28, 41, 48, 58, 77.;10. Does exposure to classical music (through instrument lessons;or concert attendance) improve children's scholastic performance? In a study;researchers measured the amount of exposure to classical music for many;children, along with their scores on the state's academic proficiency exam or;not. The explanatory variable in this study is;A. the amount of a child's exposure to classical music.;B. whether a child passed the state's proficiency exam.;C. the type of instrument a child plays.;D. the child's score on the state's proficiency exam.

Paper#56955 | Written in 18-Jul-2015

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