PSY 230 - Chapter 2
A skewed distribution typically has _____ tail(s) and a normal distribution has ____ tail(s).
1, 2
For the following scores, what is the frequency corresponding to X=3? Scores: 1,4,3,2,3,1,1,5,3,3,2,4
4
A distribution of scores is being organized in a grouped frequency distribution table with an interval width of 2 points. If the lowest score in the distribution is X = 41, then the bottom interval in the table should be _____.
40-41
In a grouped frequency distribution one interval is listed as 50-54. What are the real limits of this interval?
49.5 and 54.5
In a grouped frequency distribution one interval is listed as 50-54. What is the width of this interval?
5 points
A sample of n = 20 scores ranges from a high of X = 10 to a low of X = 3. If these scores are places in a frequency distribution table, how many rows will the table have?
8
A set of scores ranges from a high of X = 67 to a low of X = 23. If these scores are organized in a grouped frequency distribution table with an interval width of 5 points, then roughly how many intervals will be needed?
8-9
Which of the following is a method for obtaining n for the scores in a frequency distribution table?
Add the values in the f column
What kind of graph is appropriate for scores measured on a nominal scale?
Bar graph
A distribution of N = 3 scores consists of 5, 7, and 50. What is the best way to present these data?
Simply list the three scores
What determines the width of the bars in a histogram?
The real limits of a score or class interval
In a frequency distribution graph, frequencies are presented on the and the scores (categories) are listed on the ______.
Y axis/X axis
The normal distribution is an example of
a smooth curve showing data from a population
What shape would you expect for the distribution of scores from a very easy exam for a large class of students?
negatively skewed
Where are the scores with the highest frequencies located in a distribution with positive skew?
on the left side of the distribution