PSY-301 Statistics

1. A _____________ is a summary display for a distribution of data organized or summarized in terms of how often (or frequently) scores occur.

• Frequency Distribution
• Data Summary
• Score Chart
• Data Distribution

1. True or false: A researcher observes that a single parent works 42.25 hours per week. The degree of accuracy of 42.25 is to the hundredths place (.01).

• True
• False
• The degree of accuracy is to the tenths place (.1)
• The degree of accuracy is to the ones place (1)

1. Each of the following is a rule for the simple frequency distribution except:

   a. Each interval is equidistant.

   b. The same score cannot occur in more than one interval.

   c. Each interval is defined (it has a lower and an upper boundary).

   d. The interval width is equal to the number of intervals in a frequency distribution.

• Each interval is equidistant.
• The same score cannot occur in more than one interval.
• Each interval is defined (it has a lower and an upper boundary).
• The interval width is equal to the number of intervals in a frequency distribution.

1. What is the recommended number of intervals that should be included in a simple frequency distribution?

• 5-20

• 10-15
• 15-20
• 5-15

1. Why is it generally inappropriate to include an open interval in a simple frequency distribution?

• Including an open interval can make it difficult to identify if outliers exist in a data set.

• Because an open interval would make the frequency distribution too complex to understand
• Because an open interval would make the frequency distribution too simple and thus not useful
• Because an open interval would make the frequency distribution biased towards certain values

1. A ____________ is a summary display that distributes the sum of frequencies across a series of intervals.

• cumulative frequency distribution

• Frequency distribution

• frequency

• distribution

1. Cumulative frequencies can be added from the top ______ and the bottom ______.

• left, right
• right, left
• top, bottom
• down, up

1. When cumulating frequencies from the bottom up, you typically want to discuss the data in terms of:

   a. “At most”
   b. “Less than”
   c. “At or below”
   d. All of the above

• “At most”
• “Less than”
• “At or below”
• All of the above

1. True or false: Whether you cumulate a frequency distribution from the bottom up or the top down depends on how you want to discuss the data.

• True
• False
• Depends on the data
• Depends on the frequency distribution

1. When cumulating frequencies from the top down, you typically want to discuss the data in terms of:

   a. “Less than”
   b. “At or above”
   c. “At most”
   d. All of the above

• “Less than”
• “At or above”
• “At most”
• All of the above