PYC3704 - SET 5 QUESTIONS AND ANSWERS
A positive correlation between variables X and Y implies that persons scoring low
on X will generally score ______ on Y
low
Which of the values given below is the best estimate of the Pearson correlation
coefficient between the following values of X and Y?
-1
A researcher hypothesizes that the drug treatment of hospitalised schizophrenic
patients improves their mental alertness. He studies a random sample of 27 such
patients and finds a correlation coefficient of 0.6 between the number of days of
drug treatment and patients' scores on the Mental Alertness Test. Which is an
appropriate null hypothesis for this research?
p=0
The table below gives the number of persons observed to be in each of the
categories in a cross classification of gender (male/female) and place of
residence (rural/urban). What would the expected value be for persons classified
as both 'urban' and 'male', if no relationship exists between gender and place of
residence?
5
A researcher wants to determine whether a relationship exists between students'
general level of anxiety and their exam marks. He presents each student from a
random sample with a general anxiety scale just before they are to write an
important exam. Which of the following is the most appropriate test statistic to
use to determine whether a relationship exists between the two variables (anxiety
level and exam results)?
Pearson's r test statistic
Which of the following is the appropriate formula for the Chi square test?
The Pearson chi-square test statistic, is a calculation of the difference between the
observed and expected frequencies. The formula is:
This means the expected value for each cell in the contingency table is subtracted from
the observed value for that cell, squared, and divided by the expected value for that cell.
Then all of these terms are added together to yield
A psychologist reads an article in which the author claims that playing computer
games leads to higher levels of aggression in children. She decides to test this by
asking a sample of children to report the number of computer games they play
per month and measuring the aggression level of each child with an appropriate
psychometric test. She expects to find that a positive correlation will exist in her
sample between level of aggression and number of computer games played
The researcher calculates the Pearson product moment correlation coefficient of
the relationship between level of aggression and number of computer games
played. Which of following expressions best represent the relationship if the
expectations of the researcher about the relationship are true?
r>0
, A psychologist reads an article in which the author claims that playing computer
games leads to higher levels of aggression in children. She decides to test this by
asking a sample of children to report the number of computer games they play
per month and measuring the aggression level of each child with an appropriate
psychometric test. She expects to find that a positive correlation will exist in her
sample between level of aggression and number of computer games played
The researcher draws a graph of the relationship between aggression and
number of computer games. Which of the scatter plots below give the most
probable representation of the data if the expected relationship exists?
Graph A
A sample of 300 clients are drawn from three community mental health centres
(indicated in the table as A, B and C). Counts are made of those clients who are
diagnosed as having social adjustment problems, those with problems related to
anxiety, and the remaining clients are classified under 'other problems '. Counts
of the number of clients from the different centres which fall in each of the
categories are supplied below.
What is the type of arrangement of data above called?
Contingency table
A sample of 300 clients are drawn from three community mental health centres
(indicated in the table as A, B and C). Counts are made of those clients who are
diagnosed as having social adjustment problems, those with problems related to
anxiety, and the remaining clients are classified under 'other problems '. Counts
of the number of clients from the different centres which fall in each of the
categories are supplied below.
A researcher want to establish whether the types of diagnoses made differs
significantly among the different mental health centres or not. Which of the
following would be the most appropriate statistical test to use?
The Chi-square (x²) test
Research is called empirical research when ______
observations or measurements are made of objects or entities being studied
In science, including social science, the word 'theory' refers to ______
an explanation of why a phenomenon appears as it is observed to be
Inferential statistics refer to ______
using probability theory to make conclusions based on observations of data
When doing research, the term 'Operationalisation' is used to refer to the process
of ______
determining a way to get a numeric measurement of a construct which is being
measured
In social science research, the total collection of measurements across a group
of research participants is referred to as ______
data
Psychological measurements are always imperfect. The way in which a
measurement varies around its 'true' value is referred to as ______
A positive correlation between variables X and Y implies that persons scoring low
on X will generally score ______ on Y
low
Which of the values given below is the best estimate of the Pearson correlation
coefficient between the following values of X and Y?
-1
A researcher hypothesizes that the drug treatment of hospitalised schizophrenic
patients improves their mental alertness. He studies a random sample of 27 such
patients and finds a correlation coefficient of 0.6 between the number of days of
drug treatment and patients' scores on the Mental Alertness Test. Which is an
appropriate null hypothesis for this research?
p=0
The table below gives the number of persons observed to be in each of the
categories in a cross classification of gender (male/female) and place of
residence (rural/urban). What would the expected value be for persons classified
as both 'urban' and 'male', if no relationship exists between gender and place of
residence?
5
A researcher wants to determine whether a relationship exists between students'
general level of anxiety and their exam marks. He presents each student from a
random sample with a general anxiety scale just before they are to write an
important exam. Which of the following is the most appropriate test statistic to
use to determine whether a relationship exists between the two variables (anxiety
level and exam results)?
Pearson's r test statistic
Which of the following is the appropriate formula for the Chi square test?
The Pearson chi-square test statistic, is a calculation of the difference between the
observed and expected frequencies. The formula is:
This means the expected value for each cell in the contingency table is subtracted from
the observed value for that cell, squared, and divided by the expected value for that cell.
Then all of these terms are added together to yield
A psychologist reads an article in which the author claims that playing computer
games leads to higher levels of aggression in children. She decides to test this by
asking a sample of children to report the number of computer games they play
per month and measuring the aggression level of each child with an appropriate
psychometric test. She expects to find that a positive correlation will exist in her
sample between level of aggression and number of computer games played
The researcher calculates the Pearson product moment correlation coefficient of
the relationship between level of aggression and number of computer games
played. Which of following expressions best represent the relationship if the
expectations of the researcher about the relationship are true?
r>0
, A psychologist reads an article in which the author claims that playing computer
games leads to higher levels of aggression in children. She decides to test this by
asking a sample of children to report the number of computer games they play
per month and measuring the aggression level of each child with an appropriate
psychometric test. She expects to find that a positive correlation will exist in her
sample between level of aggression and number of computer games played
The researcher draws a graph of the relationship between aggression and
number of computer games. Which of the scatter plots below give the most
probable representation of the data if the expected relationship exists?
Graph A
A sample of 300 clients are drawn from three community mental health centres
(indicated in the table as A, B and C). Counts are made of those clients who are
diagnosed as having social adjustment problems, those with problems related to
anxiety, and the remaining clients are classified under 'other problems '. Counts
of the number of clients from the different centres which fall in each of the
categories are supplied below.
What is the type of arrangement of data above called?
Contingency table
A sample of 300 clients are drawn from three community mental health centres
(indicated in the table as A, B and C). Counts are made of those clients who are
diagnosed as having social adjustment problems, those with problems related to
anxiety, and the remaining clients are classified under 'other problems '. Counts
of the number of clients from the different centres which fall in each of the
categories are supplied below.
A researcher want to establish whether the types of diagnoses made differs
significantly among the different mental health centres or not. Which of the
following would be the most appropriate statistical test to use?
The Chi-square (x²) test
Research is called empirical research when ______
observations or measurements are made of objects or entities being studied
In science, including social science, the word 'theory' refers to ______
an explanation of why a phenomenon appears as it is observed to be
Inferential statistics refer to ______
using probability theory to make conclusions based on observations of data
When doing research, the term 'Operationalisation' is used to refer to the process
of ______
determining a way to get a numeric measurement of a construct which is being
measured
In social science research, the total collection of measurements across a group
of research participants is referred to as ______
data
Psychological measurements are always imperfect. The way in which a
measurement varies around its 'true' value is referred to as ______
