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Chapter 4

PNB 2XE3 Chapter Notes - Chapter 4: Level Of Measurement, Frequency Distribution


Department
Psychology, Neuroscience & Behaviour
Course Code
PNB 2XE3
Professor
Nikol Piskuric
Chapter
4

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PNB 2XE3: Descriptive Statistics Winter 2015
Dr. Piskuric
PRE-LAB 2: Chapter 4
1. Make up a set of data for which the mean is greater than the median. (4.4)
4,4,5,6,7,8,48
Mean: 11.7
Median: 6
2. A group of 20 rats running a straight alley maze required the following number of
trials to perform a predetermined criterion. The frequency distribution follows.
Trials to reach criterion: 18 19 20 21 22 23 24
Number of rats: 3 4 3 4 3 2 1
Calculate the mean, median and mode number of trials to criterion for this group.
(Modified from 4.7)
Mean: 7.35
Median: 20.5
Mode: 19 and 21
3. Create a sample of ten numbers that has a mean of 8.6. How did you accomplish this?
(The answer will help you later to understand the concept of degrees of freedom.)
(4.10)
Mean =
X
N
8.6 =
X
10
86 =
X
therefore the ten numbers could be: 1+2+3+4+5+6+7+8+9+41 = 86
4. Why is the mode (but not the mean and median) an acceptable measure for nominal
data? (4.15)
By: Tasfia Ahsan
TA: Aaron
1320425
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