6387793
Descrição
Quiz por Natalie Balzert, atualizado more than 1 year ago
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Criado por Natalie Balzert
quase 8 anos atrás
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Questão 1
Questão
The middle value in an ordered array of numbers is the _____?
Responda
-
mode
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mean
-
standard deviation
-
median
Questão 2
Questão
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) _____?
Responda
-
median
-
mean
-
mode
-
standard deviation
Questão 3
Questão
The most frequently occurring value in a set of data is the _____?
Responda
-
mode
-
mean
-
median
-
standard deviation
Questão 4
Questão
To describe the spread or dispersion of a set of data is called _____?
Responda
-
measure of variability
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range
-
standard deviation
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none of the above
Questão 5
Questão
The difference between the largest value of a data set and the smallest value of a range is the _____?
Responda
-
variability
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standard deviation
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range
-
none of the above
Questão 6
Questão
The average of the squared deviations about the mean for a set of numbers is the _____?
Responda
-
variance
-
mean
-
standard deviation
-
none of the above
Questão 7
Questão
The square root of the variance is the _____?
Responda
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mean
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variance
-
standard deviation
-
none of the above
Questão 8
Questão
For which of central value will the sum of the deviations of each value from the average always be zero?
Responda
-
Mean
-
Mode
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Median
-
None of the above
Questão 9
Questão
The relationship between the variance and the standard deviation is:
Responda
-
Variance is the square root of the standard deviation.
-
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.
Questão 10
Questão
Variability is measured by:
Responda
-
The Mean.
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The Median.
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The Standard Deviation.
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The Mode.
Questão 11
Questão
It is possible for a data set to contain:
Responda
-
Two means.
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Two medians
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Two modes
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All of the above.
Questão 12
Questão
The range of a data set is:
Responda
-
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.
Questão 13
Questão
Which of the following is referred to as the sample mean?
Responda
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X-bar
-
u
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sample
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none of the above
Questão 14
Questão
Which measures of central values are not affected by extremely low or extremely high values?
Responda
-
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
Questão 15
Questão
The range of values of the coefficient of correlation is:
Responda
-
-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
Questão 16
Questão
What does it mean if r=-1 for two variables X and Y?
Responda
-
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.
Questão 17
Questão
Which of the following measures of dispersion are based on deviation from the mean?
Responda
-
variance
-
standard deviation
-
mean deviation
-
all of the above
Questão 18
Questão
Consider the following sample data set: 4,3,8,7, and 3.
The sample mean for this data set is:
Responda
-
7
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4
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5
-
3
Questão 19
Questão
Consider the following sample data set: 4,3,8,7, and 3.
The median for this data set is:
Responda
-
4
-
2
-
3
-
5
Questão 20
Questão
Consider the following sample data set: 4,3,8,7, and 3.
The mode for this data set is:
Responda
-
5
-
4
-
0
-
3
Questão 21
Questão
Consider the following sample data set: 4,3,8,7, and 3.
The range for this data set is:
Responda
-
3
-
5
-
0
-
4
Questão 22
Questão
Consider the following sample data set: 4,3,8,7, and 3.
The variance for this data set is:
Responda
-
7.50
-
0.25
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3.50
-
5.50
Questão 23
Questão
Consider the following sample data set: 4,3,8,7, and 3.
The standard deviation for this data set is:
Responda
-
2.74
-
2.35
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2.5
-
1.58
Questão 24
Questão
Consider the following sample data set: 4,3,8,7, and 3.
The coefficient of variation for the data set is:
Responda
-
0.235
-
0.758
-
0.548
-
0.470
Questão 25
Questão
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:
Responda
-
(33000,47000)
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(36500,43500)
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(29500,55000)
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(42000,53000)
Questão 26
Questão
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?
Responda
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95%
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99%
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84%
-
68%
Questão 27
Questão
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?
Responda
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5%
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2.5%
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10%
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1%
Questão 28
Questão
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?
Responda
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2.5%
-
90%
-
86%
-
84%
Questão 29
Questão
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
Responda
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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)
Questão 30
Questão
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:
Responda
-
3.20
-
1.56
-
4.10
-
3.67
Questão 31
Questão
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:
Responda
-
0.57
-
0.93
-
0.83
-
0.10
Questão 32
Questão
You can conclude that the relationship between X and Y is:
Responda
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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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