Name:
_____________________________
PSY031 Spring08
L
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I.
Understanding the CLT
•
Go to Blackboard and open
Course Documents, Lab Information…
•
Open the folder
Lab 4
and click on the external link for
Understanding the CLT.
o
Please use Internet Explorer.
•
Once at the website, click twice on the
Begin
button located in the upperleft hand corner
(it
may take a few minutes for the new window to open)
.
•
The distribution at the top of the screen is the population from which each sample is drawn.
1)
What are the population parameters?
Describe the shape of the parent population?
μ = 16.00
σ
= 5.00
The parent population is normally distributed.
It is symmetrical
with 68% of the individual scores falling within one standard deviation.
•
Click the
animated sample
button once.
Five data points will appear on the histogram
below the parent population.
This is the
sample data.
Under the sample data histogram is
the
distribution of the means
.
This is the mean of the
sample data.
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View Full DocumentName:
_____________________________
PSY031 Spring08
L
a
b
#
4
Page 2 of 6
–
N = 5
:
For the
sample data,
this is how many data points/participant scores make up
the data set.
For the
distribution of the means
, this is the number of data points that
make up that mean.
The mean is plotted on this distribution.
–
Reps:
For the
sample data,
this is equal to N (i.e., the number of individual scores).
For the
distribution of the means
, this is the number of N=5 samples that are plotted
on your distribution (i.e., 1).
2)
What are the sample statistics for the data?
The sample statistic in this case is the mean (the sd is not given) of your
sample.
In my example, the mean for the sample data (i.e., individual scores)
is 16.39.
•
Click the
animated sample
button 5 more times.
For each time, record the
sample
statistics
for the
sample data
&
distribution of means
below before clicking the button
again
.
In total, your Distribution of means should have 6 Reps.
3)
Record the sample statistics for each 5 samples below.
After you clicked the animated
sample button five times, record the sample statistics for the distribution of the means.
How
does each of the five different sample statistics from the sample data (as a group) compare to
the parameters of the parent population?
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 Spring '08
 Dicorcia
 Statistics, Likert, parent population

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