Chebyshev\'s Theorem says that at least 95 percent of the data lie within 2 stan
ID: 2929771 • Letter: C
Question
Chebyshev's Theorem says that at least 95 percent of the data lie within 2 standard deviations of the mean.
True
False
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A discrete probability distribution:
can assume values between -1 and +1.
is a listing of all possible values of the random variable.
assigns a probability to each possible value of the random variable.
is independent of the parameters of the distribution.
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Quantitative variables use which two levels of measurement?
Ordinal and ratio
Interval and ordinal
Nominal and ordinal
Interval and ratio
In calculating the sample variance, the sum of the squared deviations around the mean is divided by n - 1 to avoid underestimating the unknown population variance.
True
False
A Likert scale:
must have a verbal label on each scale point.
must have an odd number of scale points.
yields interval data if scale distances are equal.
is rarely used in marketing surveys.
Which statement is correct?
Private statistical databases (e.g., CRSP) are usually free.
Web searches (e.g., Google) often yield unverifiable data.
Government data sources (e.g., www.bls.gov) are often costly.
Analysts rarely consult business periodicals (e.g., Bloomberg Businessweek).
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Explanation / Answer
Chebyshev's Theorem says that at least 95 percent of the data lie within 2 standard deviations of the mean.
False
A discrete probability distribution
assigns a probability to each possible value of the random variable.
Quantitative variables use which two levels of measurement?
Interval and ratio
In calculating the sample variance, the sum of the squared deviations around the mean is divided by n - 1 to avoid underestimating the unknown population variance.
True
A Likert scale
yields interval data if scale distances are equal.
Which statement is correct
Web searches (e.g., Google) often yield unverifiable data.