©SIRJOEL EXAM SOLUTIONS
10/10/2024 11:44 AM
ISDS EXAM 1 PRACTICE #2 Questions
With Correct Answers
The city of Chicago (which was not among the 20 cities) has a satisfaction rating of 85 for
Sprint. In terms of Sprint's satisfaction rating, Chicago can be considered an outlier because -
answer✔it is greater than 83.25
Anything that lies outside the upper limit and lower limit is an outlier.
Formula for upper limit = Q3 + 1.5 * IQR
Which of the following statement is true for the satisfaction ratings? - answer✔On average,
satisfaction ratings of Verizon are better
What is Sprint's interquartile range? - answer✔Formula for IQR is Q3-Q1
The correct answer is: 8.5
, ©SIRJOEL EXAM SOLUTIONS
10/10/2024 11:44 AM
How do you characterize the shape of Verizon's satisfaction rating? - answer✔Slightly
negatively skewed
What is the range for Verizon? - answer✔Formula for range is Max-Min
The correct answer is: 6
What is the value of the lower limit that is used to identify outliers for Sprint's satisfaction
rating? - answer✔Formula for lower limit is Q1- 1.5*IQR
The correct answer is: 49.25
What is the mean of the speeds (to 1 decimal point)? - answer✔Formula for mean to be used on
Excel is =average
The correct answer is: 75.2
What is the standard deviation for the speeds? (to 2 decimal points) - answer✔The formula to be
used on Excel is =stdev.s
The correct answer is: 6.53
10/10/2024 11:44 AM
ISDS EXAM 1 PRACTICE #2 Questions
With Correct Answers
The city of Chicago (which was not among the 20 cities) has a satisfaction rating of 85 for
Sprint. In terms of Sprint's satisfaction rating, Chicago can be considered an outlier because -
answer✔it is greater than 83.25
Anything that lies outside the upper limit and lower limit is an outlier.
Formula for upper limit = Q3 + 1.5 * IQR
Which of the following statement is true for the satisfaction ratings? - answer✔On average,
satisfaction ratings of Verizon are better
What is Sprint's interquartile range? - answer✔Formula for IQR is Q3-Q1
The correct answer is: 8.5
, ©SIRJOEL EXAM SOLUTIONS
10/10/2024 11:44 AM
How do you characterize the shape of Verizon's satisfaction rating? - answer✔Slightly
negatively skewed
What is the range for Verizon? - answer✔Formula for range is Max-Min
The correct answer is: 6
What is the value of the lower limit that is used to identify outliers for Sprint's satisfaction
rating? - answer✔Formula for lower limit is Q1- 1.5*IQR
The correct answer is: 49.25
What is the mean of the speeds (to 1 decimal point)? - answer✔Formula for mean to be used on
Excel is =average
The correct answer is: 75.2
What is the standard deviation for the speeds? (to 2 decimal points) - answer✔The formula to be
used on Excel is =stdev.s
The correct answer is: 6.53
