Question 1

Each set of data has 100 percentiles.

Accepted Answer

A) True 
 B)False

Question 2

You may have noticed that each score in sample 2 is obtained by subtracting 4 from the corresponding score in sample 1.Write your conclusion based on the measures of central tendency and variability.

Accepted Answer

The answer of You may have noticed that each score...

Question 3

To find percentiles and quartiles,data must first be arranged in ascending order.

Accepted Answer

A) True 
 B)False

Question 4

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
A researcher is interested in examining how the net wealth of individuals changes over the course of their lifetimes.She has collected the following data regarding the age X,in years,and net worth Y,measured in thousands of dollars,of 12 individuals in the form of (x,y)pairs: (24,153),(34,201),(38,297),(83,139),(77,167),(32,123),(71,247),(49,263),(54,352),(35,321),(65,453),and (30,54).
-Prepare a scatter plot of this data.

Accepted Answer

The answer of THE NEXT QUESTIONS ARE BASED ON THE...

Question 5

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
A recent survey asked respondents about their monthly purchases of raffle tickets.The monthly expenditures,in dollars,of ten people who play the raffle are 23,15,11,20,28,35,13,10,20,and 24.
-Which of the following statements is not true?

Accepted Answer

A) The 75th percentile is equal to 23.5. 
B) The median is equal to the mode. 
C) The mean is 19.9. 
D) The distribution is approximately symmetric.

Question 6

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
A recent survey asked respondents about their monthly purchases of raffle tickets.The monthly expenditures,in dollars,of ten people who play the raffle are 23,15,11,20,28,35,13,10,20,and 24.
-Over the past 10 years,the return on Stock A has averaged 8.4% with a standard deviation of 2.1%.The return on Stock B has averaged 3.6% with a standard deviation of 0.9%.Which of the following statements is true?

Accepted Answer

A) Stock A has smaller relative variation than Stock B. 
B) Stock B has smaller relative variation than Stock A. 
C) Both stocks exhibit the same relative variation. 
D) Unable to tell with the given information.

Question 7

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
Consider the following (x,y)sample data:
(24,24),(19,33),(21,31),(10,36),(22,30),(13,36),(21,32),(23,26),(20,26),and
(21,31).
-Consider the following two sets of data:
  
Compare the following measures for both sets:  
,  
,  
,and the range.Comment on the meaning of these comparisons.

Accepted Answer

The answer of THE NEXT QUESTIONS ARE BASED ON THE...

Question 8

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
In a recent survey,12 students at a local university were asked approximately how many hours per week they spend on the Internet.Their responses were: 13,0,5,8,22,7,3,0,15,12,13,and 17.
-What is the coefficient of variation for this data?

Accepted Answer

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Question 9

A distribution that has the same shape on either side of the center is said to be symmetrical.

Accepted Answer

A) True 
 B)False

Question 10

Determine if there exists a relationship between ice cream sales and temperature.

Accepted Answer

The answer of Determine if there exists a relationship between...

Question 11

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
The police lieutenant in charge of the traffic division has reviewed the number of traffic citations issued per day by each of the 10 police officers in his division.The data were: 13,21,12,34,31,13,22,26,25,and 23.
-What is the mode of the number of citations issued per day?

Accepted Answer

A) 22.0 
B) 22.5 
C) 13.0 
D) 13.5

Question 12

A negatively skewed distribution is not symmetrical.The long tail is to the right.

Accepted Answer

A) True 
 B)False

Question 13

The mode is used infrequently in business applications because it:

Accepted Answer

A) is difficult to compute. 
B) does not represent the true center of numerical data. 
C) is too labor intensive. 
D) is an accurate measure of central tendency.

Question 14

The median value of the data values 12,32,48,8,22,9,30,and 18 equals:

Accepted Answer

A) 20 
B) 22 
C) 24 
D) 26

Question 15

The first quartile and the 25th percentile are the same.

Accepted Answer

A) True 
 B)False

Question 16

Determine if there exists a relationship between the age and net worth of individuals.

Accepted Answer

The answer of Determine if there exists a relationship between...

Question 17

The median and the 50th percentile are always equal.

Accepted Answer

A) True 
 B)False

Question 18

What is the relationship among the mean,median,and mode in a positively skewed distribution?

Accepted Answer

A) They are all equal. 
B) The mean is always the smallest value. 
C) The mean is always the largest value. 
D) The mode is the largest value.

Question 19

Find the percentage of measurements in the intervals  
± s and  
± 2s.Compare these results with the Empirical Rule percentages,and comment on the shape of the distribution.

Accepted Answer

The answer of Find the percentage of measurements in the...

Question 20

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
The following data represents the number of minutes an athlete spends training per day.
  
The mean and standard deviation were computed to be 85.54 and 6.97,respectively.The median is 85.5
-What percentage of the measurements actually lie within the interval (71.60,99.48)?

Accepted Answer

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Exam 2: Describing Data: Numerical

Each set of data has 100 percentiles.

You may have noticed that each score in sample 2 is obtained by subtracting 4 from the corresponding score in sample 1.Write your conclusion based on the measures of central tendency and variability.

To find percentiles and quartiles,data must first be arranged in ascending order.

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: A recent survey asked respondents about their monthly purchases of raffle tickets.The monthly expenditures,in dollars,of ten people who play the raffle are 23,15,11,20,28,35,13,10,20,and 24. -Which of the following statements is not true?

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: In a recent survey,12 students at a local university were asked approximately how many hours per week they spend on the Internet.Their responses were: 13,0,5,8,22,7,3,0,15,12,13,and 17. -What is the coefficient of variation for this data?

A distribution that has the same shape on either side of the center is said to be symmetrical.

Determine if there exists a relationship between ice cream sales and temperature.

A negatively skewed distribution is not symmetrical.The long tail is to the right.

The mode is used infrequently in business applications because it:

The median value of the data values 12,32,48,8,22,9,30,and 18 equals:

The first quartile and the 25^th percentile are the same.

Determine if there exists a relationship between the age and net worth of individuals.

The median and the 50^th percentile are always equal.

What is the relationship among the mean,median,and mode in a positively skewed distribution?

Find the percentage of measurements in the intervals ± s and ± 2s.Compare these results with the Empirical Rule percentages,and comment on the shape of the distribution.