Stats Chapter 1-4
A dot plot is best applied when _____________________.
A single variable is summarized
The interquartile range is graphically presented in a ___________.
Dot plot
For a relative frequency distribution, relative frequency is computed as _____________.
Frequency Class divided by the total Frequency
The sum of the deviations of each data value from this __________ will always be zero.
Mean
For a data set, half of the observations are always greater than the ____.
Median
What is an example of a continuous variable?
Tons of concrete to complete a parking garage
T/F. In a bar chart, the x-axis is labeled with the values of a qualitative variable.
True
T/F. The principal difference between the interval and ratio scale is that the ratio scale has a meaningful zero point.
True
The higher the standard deviation is to the mean......
the more dispersion the data is
what is the symbol of population
the weird u
A relationship between two nominal variables is summarized by a contingency table.
A contingency table
What is the possible range of values for Pearson's coefficient of skewness?
-3 and +3
T/F. A store asks shoppers for their zip code to identify market areas. Zip codes are an example of ratio data.
False
T/F. For any distribution, there are an equal number of values above and below the mean
False
A dot plot shows ____________.
The general shape of a distribution
What statistics are needed to draw a box plot?
The minimum, maximum, median, first and third quartiles.
Data measured on a nominal scale can only be classified into categories.
True
T/F A population is a collection of all individuals, objects, or measurements of interest.
True
T/F To convert a frequency distribution to a relative frequency distribution, divide each class frequency by the sum of the class frequencies.
True
T/F. A class interval, or class width, can be determined by subtracting the lower limit of a class from the lower limit of the next higher class.
True
T/F. A dot plot is useful for quickly graphing frequencies in a small data set.
True
T/F. A pie chart shows the relative frequency in each class
True
T/F. For any data set, Chebyshev's theorem estimates the proportion of observations that occurs within k standard deviations of the mean, where k is greater than 1.0.
True
In order to convert class frequency to relative class frequency,
divide the frequency by the sample size
T/F Descriptive statistics are used to find out something about a population based on a sample.
false
A portion or part of a population is called a:
sample