The following table presents the number of students absent

Statistics for Engineers and Scientists | 4th Edition | ISBN: 9780073401331 | Authors: William Navidi

Problem 11E Chapter 1.3

Statistics for Engineers and Scientists | 4th Edition

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Statistics for Engineers and Scientists | 4th Edition | ISBN: 9780073401331 | Authors: William Navidi

Statistics for Engineers and Scientists | 4th Edition

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Problem 11E

The following table presents the number of students absent in a middle school in northwestern Montana for each school day in January 2008.

Date

Number Absent

Date

Number Absent

Date

Number Absent

Jan. 2

65

Jan. 14

59

Jan. 23

42

Jan. 3

67

Jan. 15

49

Jan. 24

45

Jan. 4

71

Jan. 16

42

Jan. 25

46

Jan. 7

57

Jan. 17

56

Jan. 28

100

Jan. 8

51

Jan. 18

45

Jan. 29

59

Jan. 9

49

Jan. 21

77

Jan. 30

53

Jan. 10

44

Jan. 22

44

Jan. 31

51

Jan. 11

41

 

 

 

 

a.         Construct a boxplot.

b. There was a snowstorm on January 27. Was the number of absences the next day an outlier?

Step-by-Step Solution:

Answer :

Step 1 of 3 :

Given, the number of students absent in a middle school in the northwestern Montana for each school day in January 2008

Date

Number of Absent

Date

Number of Absent

Date

Number of Absent

Jan. 2

65

Jan. 14

59

Jan. 23

42

Jan. 3

67

Jan. 15

49

Jan. 24

45

Jan. 4

71

Jan. 16

42

Jan. 25

46

Jan. 7

57

Jan. 17

56

Jan. 28

100

Jan. 8

51

Jan. 18

45

Jan. 29

59

Jan. 9

49

Jan. 21

77

Jan. 30

53

Jan. 10

44

Jan. 22

44

Jan. 31

51

Jan. 11

41

The claim is to draw the box plot and find out the outlier

Step 2 of 3 :

The claim is to plot the boxplot

From the R-software

(a) first enter the data in excel sheet and save the data

(b)import the data from excel to R-software by using the code

 absent =read.table("C:\\Users\\hubscope\\Desktop\\absent.txt", sep="\t", header=T)

(b)plot the boxplot by using the code

boxplot(absent$x, main="boxplot", xlab="x")

Step 3 of 3

Chapter 1.3, Problem 11E is Solved
Textbook: Statistics for Engineers and Scientists
Edition: 4th
Author: William Navidi
ISBN: 9780073401331

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