6387793
Descripción
Test por Natalie Balzert, actualizado hace más de 1 año
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Creado por Natalie Balzert
hace alrededor de 8 años
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Pregunta 1
Pregunta
The middle value in an ordered array of numbers is the _____?
Respuesta
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mode
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mean
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standard deviation
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median
Pregunta 2
Pregunta
The average of a group of number which is computed by summing all numbers and dividing buy the number of numbers is called the (arithmetic) _____?
Respuesta
-
median
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mean
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mode
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standard deviation
Pregunta 3
Pregunta
The most frequently occurring value in a set of data is the _____?
Respuesta
-
mode
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mean
-
median
-
standard deviation
Pregunta 4
Pregunta
To describe the spread or dispersion of a set of data is called _____?
Respuesta
-
measure of variability
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range
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standard deviation
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none of the above
Pregunta 5
Pregunta
The difference between the largest value of a data set and the smallest value of a range is the _____?
Respuesta
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variability
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standard deviation
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range
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none of the above
Pregunta 6
Pregunta
The average of the squared deviations about the mean for a set of numbers is the _____?
Respuesta
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variance
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mean
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standard deviation
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none of the above
Pregunta 7
Pregunta
The square root of the variance is the _____?
Respuesta
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mean
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variance
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standard deviation
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none of the above
Pregunta 8
Pregunta
For which of central value will the sum of the deviations of each value from the average always be zero?
Respuesta
-
Mean
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Mode
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Median
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None of the above
Pregunta 9
Pregunta
The relationship between the variance and the standard deviation is:
Respuesta
-
Variance is the square root of the standard deviation.
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Variance is the square of the standard deviation.
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Variance is twice the standard deviation.
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There is no relationship between variance and standard.
Pregunta 10
Pregunta
Variability is measured by:
Respuesta
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The Mean.
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The Median.
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The Standard Deviation.
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The Mode.
Pregunta 11
Pregunta
It is possible for a data set to contain:
Respuesta
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Two means.
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Two medians
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Two modes
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All of the above.
Pregunta 12
Pregunta
The range of a data set is:
Respuesta
-
the difference between any two values.
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the difference between the smallest and largest values.
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the difference between the mean and the median.
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none of the above.
Pregunta 13
Pregunta
Which of the following is referred to as the sample mean?
Respuesta
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X-bar
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u
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sample
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none of the above
Pregunta 14
Pregunta
Which measures of central values are not affected by extremely low or extremely high values?
Respuesta
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mean and median
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mean and mode
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mode and median
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none of the above
Pregunta 15
Pregunta
The range of values of the coefficient of correlation is:
Respuesta
-
-1% and 1% inclusive
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0 and +1 inclusive
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-1 and +1 inclusive
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unlimited values
Pregunta 16
Pregunta
What does it mean if r=-1 for two variables X and Y?
Respuesta
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X can perfectly predict Y
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X and Y are not dependent on each other
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high values of X are associated with low values of Y
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none of the above.
Pregunta 17
Pregunta
Which of the following measures of dispersion are based on deviation from the mean?
Respuesta
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variance
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standard deviation
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mean deviation
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all of the above
Pregunta 18
Pregunta
Consider the following sample data set: 4,3,8,7, and 3.
The sample mean for this data set is:
Respuesta
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7
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4
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5
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3
Pregunta 19
Pregunta
Consider the following sample data set: 4,3,8,7, and 3.
The median for this data set is:
Respuesta
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4
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2
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3
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5
Pregunta 20
Pregunta
Consider the following sample data set: 4,3,8,7, and 3.
The mode for this data set is:
Respuesta
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5
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4
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0
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3
Pregunta 21
Pregunta
Consider the following sample data set: 4,3,8,7, and 3.
The range for this data set is:
Respuesta
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3
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5
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0
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4
Pregunta 22
Pregunta
Consider the following sample data set: 4,3,8,7, and 3.
The variance for this data set is:
Respuesta
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7.50
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0.25
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3.50
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5.50
Pregunta 23
Pregunta
Consider the following sample data set: 4,3,8,7, and 3.
The standard deviation for this data set is:
Respuesta
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2.74
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2.35
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2.5
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1.58
Pregunta 24
Pregunta
Consider the following sample data set: 4,3,8,7, and 3.
The coefficient of variation for the data set is:
Respuesta
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0.235
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0.758
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0.548
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0.470
Pregunta 25
Pregunta
Human Resources Department of one hotel reports that annual salaries for its personnel have a mean of $40,000 and a standard deviation of $3,500.
If the salaries are SYMMETRICALLY distributed, the interval of salaries representing two standard deviations on either side of the mean is:
Respuesta
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(33000,47000)
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(36500,43500)
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(29500,55000)
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(42000,53000)
Pregunta 26
Pregunta
Human Resources Department of one hotel reports that annual salaries for its personnel have a mean of $40,000 and a standard deviation of $3,500.
What proportion of the salaries is within $3,500 of the mean?
Respuesta
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95%
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99%
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84%
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68%
Pregunta 27
Pregunta
Human Resources Department of one hotel reports that annual salaries for its personnel have a mean of $40,000 and a standard deviation of $3,500.
What proportion of the salary is below $33,000?
Respuesta
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5%
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2.5%
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10%
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1%
Pregunta 28
Pregunta
Human Resources Department of one hotel reports that annual salaries for its personnel have a mean of $40,000 and a standard deviation of $3,500.
If the salaries are 5/2 standard deviation of the mean?
Respuesta
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2.5%
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90%
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86%
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84%
Pregunta 29
Pregunta
Consider the following sample data describing the relationship between the variables X and Y.
X = 3,4,6,7
Y = 1,4,5,6
The standard deviation of X and standard deviation of Y are respectively
Respuesta
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(1.58, 1.58)
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(1.83, 2.16)
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(3.33, 4,67)
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(1.25, 2.25)
Pregunta 30
Pregunta
Consider the following sample data describing the relationship between the variables X and Y.
X = 3,4,6,7
Y = 1,4,5,6
The covariance of X and Y is:
Respuesta
-
3.20
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1.56
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4.10
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3.67
Pregunta 31
Pregunta
Consider the following sample data describing the relationship between the variables X and Y.
X = 3,4,6,7
Y = 1,4,5,6
The correlation coefficient of X and Y is:
Respuesta
-
0.57
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0.93
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0.83
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0.10
Pregunta 32
Pregunta
You can conclude that the relationship between X and Y is:
Respuesta
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strong
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weak
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mild
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non-existent
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