Q4
Quiz by Dmitry Kislitsyn
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- Q1
Which of the following is the most frequently used measure of variation?
The standard deviation
The interquartile range
The coefficient of variation
The range
30s - Q2
Which of the following measures is not affected by extreme values in the data?
The mean
The median
The standard deviation
The range
30s - Q3
The following data reflect the number of customers who test drove new cars each day for a sample of 20 days.
Given these data, what is the range?
4
10
16
There is no right answer
30s - Q4
In order to compute the standard deviation, the level of data measurement should be:
Nominal
Qualitative
Ratio or interval
Ordinal
30s - Q5
Under what circumstances is it necessary to use the coefficient of variation to compare relative variability between two or more distributions?
When the standard deviations of the distributions are equal
When the means of the distributions are not equal
When the standard deviation of the distributions are not equal
When the means of the distributions are equal
30s - Q6
Consider the following data, which represent the number of miles that employees commute from home to work each day. There are two samples: one for males and one for females.
Which of the following statements is true?
Males and females on overage commute the same distance
The males in the sample commute farther on average than the females
The female distribution is more variable since the range for the females is greater than for the males
Females in the sample commute farther on average than do males
120s - Q7
Consider the following data, which represent the number of miles that employees commute from home to work each day. There are two samples: one for males and one for females.
The coefficient of variation of commute miles for the males is:
approximately 8%
approximately 67%
approximately 62%
approximately 76%
120s - Q8
Consider the following data, which represent the number of miles that employees commute from home to work each day. There are two samples: one for males and one for females.
Which of the following statements is true?
Females have the larger mean
The coefficient of variation is larger for males than for females
Females have the larger range
The coefficient of variation is larger for females than for males
20s - Q9
Consider the following data, which represent the number of miles that employees commute from home to work each day. There are two samples: one for males and one for females.
The variance of commute miles for the females is:
Approximately 40
Approximately 50
Approximately 43.2
There is no right answer
120s - Q10
The advantage of using interquartile range instead of the range as a measure of variation is
It is easier to compute
It utilizes all the data in its computation
It gives a value that is closer to the true variation
It is less affected by extremes in the data
120s
