Ledet 12.1
the sum of all the data items divided by the number of dataitems, is the measure of central tendency called the
Mean
When finding the mean, it is necessary to arrange the data items in order.
The statement is false. To make the statement true, change "mean" to "median".
A data set can contain more than one median, or no median at all.
The statement is false. To make the statement true, change "median" to "mode" in each instance.
The measure of central tendency that is found by adding the lowest and highest data values and dividing the sum by 2 is called the
midrange
A data value that occurs most often in a data set is the measure of central tendency called the _____.
mode
frequency distribution.
If data values are listed in one column and the adjacent column indicates the number of times each value occurs, the data presentation is called a _______.
frequency polygon./horizontal axis.
If the midpoints of the tops of the bars of a histogram are connected with straight lines, the resulting line graph is a data presentation called a/an _______. To complete such a graph at both ends, the lines are drawn down to touch the _______.
The measure of central tendency that is the data item in the middle of ranked, or ordered, data is called the _____.
median
Determine whether the statement is true or false. If the statement is false, make the necessary change(s) to produce a true statement. One disadvantage of a stem-and-leaf plot is that it does not display the data items
. False. One advantage of a stem-and-leaf plot is that it displays the data items.
stem-and-leaf plot.
A data presentation that separates each data item into two parts is called a _______.
random sample
A sample obtained in such a way that every element in the population has an equal chance of being selected is called a/an _______ sample.
Determine whether the following statement is true or false. If the statement is false, make the necessary change(s) to produce a true statement. Numbers representing what is average or typical about a data set are called measures of central tendency.
A. The statement is true because these numbers are generally located toward the center of a distribution.
Determine whether the following statement is true or false. If the statement is false, make the necessary change(s) to produce a true statement. A call-in poll on radio or television is not reliable because the sample is not chosen randomly from a larger population.
B. The statement is true because people choose to call in. They are not randomly selected.
histogram./frequencies
Data can be displayed using a bar graph with bars that touch each other. This visual presentation of the data is called a/an _______. The heights of the bars represent the _______ of the data values.
Determine whether the statement is true or false. If the statement is false, make the necessary change(s) to produce a true statement. A sample is the set of all the people or objects whose properties are to be described and analyzed by the data collector.
False. A population is the set of all the people or objects whose properties are to be described and analyzed by the data collector.
grouped frequency distribution.
Suppose a data presentation is given where data values are listed in one column and the adjacent column indicates the number of times each value occurs. If this data presentation is varied by organizing the data into classes, the data presentation is called a/an _______.
The government of a large city needs to determine whether the city's residents will support the removal of the city's universitythe removal of the city's university. The government decides to conduct a survey of a sample of the city's residents. Which one of the following procedures would be the most appropriate for obtaining a sample of the city's residents?
Survey a random sample of persons within each neighborhoodeach neighborhood.
