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Posted: January 26th, 2024
Assignment 1; Psych 2021 3.0 C
(Make sure to show all your work, including your
formulas, for all calculations)
Total marks: 25
1. Recently on the Comedy
Channel a female Canadian comic asked the following question:
âWhen you are
out at a bar have you ever noticed that after four or five drinks all the ugly
people seem to have gone home?â
The premise of
her question is that alcohol consumption alters our perception of
attractiveness.Imagine
that an experimenter wanted to determine if this change in our perception of
attractiveness was related to our experience with alcohol. To test this
idea s/he collected the following data from 25 experienced drinkers and 25
inexperienced drinkers. Each of the numbers below is the number of drinks (1
ounce shots) required to alter the participantâs perception of attractiveness.
Experienced Drinkers:
8, 7, 2, 1, 6, 7, 7, 5, 8, 5, 4, 7, 7, 6, 6, 3, 6, 6, 3, 8, 4, 2, 5,
6, 6
Inexperienced Drinkers:
8, 5, 4, 4, 3, 3, 2, 6, 2, 3, 1, 6, 3, 2, 4, 5, 4, 4, 3, 4, 5, 7, 5,
5, 4
Answer the following four questions based
on the data above.
A. What
is the dependent variable and what is the independent (or quasi-independent)
variable in this study?(2 marks)
Dependent: Performance:
Subjects perception of attractiveness based on experience
Quasi-Independent
variable: Amount of experience subjects
have with alcohol, âExperienced or inexperienced drinkerâ
B. As measured in this study
is the dependent variable continuous or discrete, and what type of scale was
used to measure it?(2 marks)
Discrete variable
Ordinal Scale
C. Plot the data from both the
Experienced Drinkers and the Inexperienced Drinkers in a single polygon graph.
Be sure to clearly label your axes and to indicate which curve belongs to which
group.(4 marks)
D. Calculate
the unbiased standard deviation for the Experienced Drinkers only.(3 marks)
2. Imagine
you took three exams with the following results:
Exam Your
Score m s
Intro to Psych 85 82 10
Statistics 80 75 8
English 80 90 12
What
appears to be your strongest subject area and how did you come to this
conclusion?(4 marks)
3. You
walk into statistics class one day and find that youâre having a pop quiz.
Looking at the exam, you find that there are 72 multiple-choice questions with
three possible responses (A, B, or C) for each, where only one is correct. The
passing grade is set at 50%. Unluckily for you, you havenât been to a single
class before this, nor have you ever opened the textbook. Actually, you canât
even say for sure who the guy is at the front of the class. You will have to
guess the answer on all the questions. What is the probability that you will
pass the exam?(7 marks)
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