Chapter 11 Practice Quiz Answer Key - Making Sense of Data

Sometimes there are more observations in one tail than the other.

Each of the following accurately describes the normal distribution, except

50 percent

What percentage of observations should fall above the mean in the normal distribution?

interval

Which level of measurement best describes a variable with the following characteristics? Numbers are assigned to objects such that interval differences are constant across the scale, but there is no true or meaningful zero point.

ordinal

Which level of measurement best describes a variable with the following characteristics? Variable values or labels having an implicit but unspecified or measured order. Numbers may be assigned to categories to show ordering or ranking, but strictly speaking, with arithmetical operations are inappropriate.

mean

Which of the following measures of central tendency describes the average value in a batch of numbers?

mode

Which of the following measures of central tendency describes the most frequently observed value in a batch of numbers?

pie chart

A _________ is a circular representation of a set of observed values in which the entire circle (or pie) stands for all the observed values and each slice of the pie is the proportion or percentage of the observed values in each category.

histogram

A _________ is a type of bar graph in which the height and area of the bars are proportional to the frequencies in each category of a nominal variable or in intervals of a continuous variable.

True

T/F: A descriptive statistic is a number that, because of its definition and formula, describes certain characteristics or properties of a batch of numbers.

False

T/F: A measure of central tendency indicates the variability of a distribution.

False

T/F: A relative frequency is the total proportion of observations at or below a value in a frequency distribution.

True

T/F: An empirical frequency distribution is a table that shows the number of observations having each value of a variable.

False

T/F: The mean is a good example of a resistant measure that is not sensitive to one or a few extreme values.

False

T/F: The standard deviation measures dispersion by totaling the absolute value of the deviation of each score from the mean and then dividing by the number of cases.

True

T/F: The sum of deviations from the mean is always zero.

True

T/F: The variance can be calculated by squaring the standard deviation.

nominal

The level of measurement that would best describe variable values that are unordered names or labels is