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ISDS EXAM 1 PRACTICE #2 QUESTIONS AND 100% CORRECT ANSWERS
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ISDS EXAM 1 PRACTICE #2 QUESTIONS AND 100%CORRECT ANSWERS
The satisfaction rating for Sprint in the city of Chicago is 85. It was not one of the 20
cities. Since it is higher than 83.25, City of Chicago can be treated as an outlier in terms
of Sprint's satisfaction rating.
Anything that falls out of 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
How do you describe 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
Correct answer: 6.53
What is the z-score for a vehicle travelling at a speed of 62mph? - ANSWER The formula
for working out z-score is (x - mean)/standard deviation
Correct answer: -2
What is the range for the dataset? - ANSWER The formula for range is Max-Min
Correct answer is : 29
Calculate the z score for a speed of 88mph? - ANSWER Formula to find the z score is: (x -
mean)/standard deviation
Correct answer is: 2
Using Chebyshev's Theorem, what percent of cars will have a speed between 62mph
and 88mpoh? - ANSWER Chebyshe's Theorem formula = (1- (1/z^2))*100%
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