PSYC2020 A1 .pdf


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PSYCHOLOGY 2020 6.0 - STATISTICAL METHODS I AND II – 2013-2014
ASSIGNMENT #1: FREQUENCIES, CENTRAL TENDENCY, AND VARIATION
DUE THURSDAY, OCTOBER 3, 2013 AT 2:30 PM IN THE TUTORIAL
You are a member of a research team interested in the cognitive effect of alcohol and marijuana. Your team
has conducted a study in which an Introductory Statistics class was randomly divided into two groups. Group 1 was
administered a dosage of alcohol. Group 2 was given an equivalent dosage of marijuana. Fifteen minutes after
administration, both groups were asked to solve a puzzle. The experimenter recorded the amount of time in seconds it
took for each subject to solve the puzzle. The results are reported below.
Marijuana
29
23
21
14
26
22
32
25
19
25
31
23
27
35
28
31
21
31
29
19
16
25
17
37
18
17
26
20
23
27
1)
2)
3)
4)
5)

Alcohol
30
28
25
22
27
26
24
27
23
32
18
25
28
19
26
20
25
19
26
23
22
28
21
23
21
23
29
24
27
27

Draw a grouped frequency histogram for each condition.
Find the mean and median for each condition (using the ungrouped data.) Is the grouped mean or the
ungrouped mean more accurate, and why? Is the grouped median or the ungrouped median more accurate,
and why?
Determine the range for each condition (again, for the ungrouped data only). What is the main problem with
this measure of variability?
Calculate the semi-interquartile range, mean deviation, variance, and standard deviation for each condition (for
the ungrouped data).
Based on all the statistical techniques performed in this assignment what conclusions can be made about the
two distributions of scores? What conclusions can be made about the difference between alcohol and
marijuana with respect to performance on the problem solving task?
NOTE: Please show all of your calculations


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