Introduction to the Practice of Statistics 9th edition by David S. Moore Test bank
y = 0.9144x – 2.286
where x is the measurement in yards and y in meters. The mean and standard deviation (in meters), respectively, should now be reported as _____.
A)217.4 and 1.90
B)217.4 and 4.19
C)215.2 and 4.19
D)215.2 and 1.90
E)This cannot be determined without knowing the actual measurements.
148.For describing the distribution of a set of data, when is the five-number summary preferred over the mean and standard deviation s?
A)When the distribution is reasonably symmetric
B)When the distribution has little skewness and there are no outliers
C)If the data are provided in increasing order of magnitude
D)If the data exhibit skewness and there are strong outliers
E)Never, because the mean and standard deviation are always more reliable
149.A sample was taken of 20 salaries of employees in a large company. The following are the annual salaries (in thousands of dollars).For convenience, the data have been ordered.
28313435374142424247
49515252606167727577
What is the median salary of the 20 employees?
150.A sample was taken of 20 salaries of employees in a large company. The following are the annual salaries (in thousands of dollars). For convenience, the data have been ordered.
28313435374142424247
49515252606167727577
A histogram of the 20 salaries is slightly skewed to the right. What do we know about the mean salary of these 20 salaries, based on this information?
151.A sample was taken of 20 salaries of employees in a large company. The following are the annual salaries (in thousands of dollars). For convenience, the data have been ordered.
28313435374142424247
49515252606167727577
What is the first quartile of the 20 salaries?
152.A sample was taken of 20 salaries of employees in a large company. The following are the annual salaries (in thousands of dollars). For convenience, the data have been ordered.
28313435374142424247
49515252606167727577
What is the interquartile range of the 20 salaries?
153.A sample was taken of 20 salaries of employees in a large company. The following are the annual salaries (in thousands of dollars).For convenience, the data have been ordered.
28313435374142424247
49515252606167727577
Suppose each employee in the company receives a $3000 raise for next year (each employee's salary is increased by $3000). For each of the following summary measures, indicate how it would change after the raise.
A)The median salary
B)The interquartile range of the salaries
C)The standard deviation of the salaries
154.A boxplot of a sample of 20 salaries from a company is shown below.
For each of the following sentences, fill in the blank.
A)The maximum salary is approximately __________________.
B)The minimum salary is approximately __________________.
C)The interquartile range is approximately __________________.
D)Seventy-five percent of the employees in this sample of 20 earn more than approximately _____________.
155.A boxplot of a sample of 20 salaries from a company is shown below.
Based on this boxplot, answer each of the following questions with yes, no, or can't tell.
A)Is the salary distribution fairly symmetric?
B)Do about 10 employees make more than $55,000?
C)Does nobody make more than $71,000?
D)Is the range of the salaries roughly $35,000?
156.A boxplot of a sample of 20 salaries from a company is shown below.
Based on this boxplot, determine the (approximate) values of the five-number summary.
157.Psychopathic Personality Disorder (psychopathy) is defined as a condition that negatively affects one's level of empathy, conscience, and impulse control. A questionnaire was developed by Lilienfeld (1990) to asses one's level of psychopathy. Ninety random people were asked to take Lilienfeld's test. Their results are shown in the histogram below.
The scores on Lilienfeld's questionnaire range from 275 to 475.
A)True
B)False
C)This cannot be determined from the information given.
158.Psychopathic Personality Disorder (psychopathy) is defined as a condition that negatively affects one's level of empathy, conscience, and impulse control. A questionnaire was developed by Lilienfeld (1990) to asses one's level of psychopathy. Ninety random people were asked to take Lilienfeld's test. Their results are shown in the histogram below.