Test 3 Flashcards
A researcher measures the time it takes for subjects to press a button following a signal. This is a(n) ________ measure.
Ratio scale
Any set of scores may be described by measures of ________ and ________.
central tendency; variability
The range and the standard deviation are both
measures of variability.
descriptive statistics.
useful ways to summarize data.
If the data is being considered a population on its own..
we divide by the number of data points, N
If the data is a sample from a larger population…
we divide by one fewer than the number of data points in the sample, n-1
An interval scale is preferable to an ordinal scale because
sophisticated statistics can be used.
A teacher writes the results of a test on the board: 7 students received A’s, 10 students received B’s, 18 students received C’s, 4 students received D’s, and 1 student received an F. In statistical terms, this is a
frequency distribution.
A host of a home repair program rates the difficulty of various home improvement projects. He assigns the level of difficulty by using hammers: 3 for very difficult, 2 for moderate, and 1 for easy. This measure is an example of a(n) _____ scale.
ordinal
The range and the standard deviation are both
measures of variability.
descriptive statistics.
useful ways to summarize data.
An ordinal scale of measurement lacks which one of the following properties of a scale?
Equal intervals
A researcher measures the time it takes for subjects to press a button following a signal. This is a(n) ________ measure.
ratio scale
Difference between histogram and polygon frequency
Histogram uses bars
Polygon frequency uses lines
