Depending on the numbers in a data set, the sum of deviations from the arithmetic mean for the set of numerical data may be greater than or less than zero.

For a set of data that are distributed in a bell or mound shape, approximately what percentage of values will lie between the mean and two standard deviations?

For a skewed distribution, what is the minimum percentage of the observations that will lie within 2.5 standard deviations of the mean based on Chebyshev’s rule?

Compared to the formula for determining the population variance, the formula for determining the sample variance is ________.

If the z-score of an observation in a set of normally distributed numerical data is bigger than zero, it means that the observation is ________. hint: z score= (x-x̄)/s

If the sample variance of a dataset of size 8 is 2.57, what is the population variance if considering the same dataset to be a population?

Which one of the following is not used in developing a box and whisker plot to describe the distribution of data?

For a set of data with a distribution skewed to the left ________.