Which of the following is true about cross-tabulation?

Each observation can belong to more than one subcategories of a categorical variable.

None of the choices is true

A cross-tabulation table is often called a latent class model.

The table displays the number of categorical variables between two observations.

All subcategories together must constitute the complete data set.

Which of the following is true from the equation:(_i-)=0

=0, where is sample mean?

Group of answer choices

The specific set of values does not have any outliers affecting the mean

Half the data lie below the mean of the values

Half the data lie above the mean of the values

The sum of the deviations above the mean are the same as the sum of the deviations below the mean

Which of the following values of the coefficients of variation of stocks represents the least risky stock?

0.045

0.5

0.05

1.0

Which of the following describes dispersion in statistics?

the measure of outliers in the data

the degree of variation in the data

the central value in the data

the frequency of values in the data

Which of the following is true of variance?

It is the square root of standard deviation.

It only requires the middle 50% of data to be calculated.

Its value is inversely proportional to the degree to which the data is spread from the mean.

The formula to calculate variance of a population is not the same as the formula to calculate variance of a sample.

In statistics, ________ refers to the peakedness or flatness of a histogram.

Sharpe ratio

kurtosis

skewness

Markov chain

If the distribution of observations are such that mode < median < mean, the histogram would be said to be negatively skewed

Group of answer choices

True

False

Which of the following is true for a median?

Medians are not affected by outliers.

Medians can be calculated no matter how the data is arranged.

A median is only meaningful for interval or ordinal data and not for ratio data.

Median is always less than mode.

Which of the following is a weighted average of the squared deviations from the expected value?

kurtosis

variance

mean difference

skewness

In the z-score formula, which of the following is true if the value in the numerator is a negative value?

that the numerator value cannot be divided by the standard deviation

that the mean is of lesser value than the x_i value

that the mean is of negative value

Which of the following is true when you compare a mean and a median?

A median is not affected by outliers; a mean is affected by outliers.

A mean divides the data half above it and half below it; a median does not.

A median is not meaningful for ratio data; a mean is meaningful to ratio data.

A mean is an observation that occurs most frequently; a median is the average of all observations.

Which of the following types of conditions is most likely to make a midrange value useless?

having the data arranged from least to greatest in value

having extreme values in a data

having repetitious values in the data set

having a small sample size

Which of the following is a similarity between a midrange and a mean?

Both measures are calculated using all the values in a data set.

Both measures can only be used for small sample sizes.

Both measures divide the data into two equal halves.

Both measures are affected by outliers.

Which of the following is true for a mode?

Modes are affected by outliers.

Modes are the mid values of data arranged from least to greatest.

The highest bar in a histogram is its mode.

Modes cannot be used in data having repetitious values